diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index cce8923f..81417a21 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -6,8 +6,7 @@
   <component name="ChangeListManager">
     <list default="true" id="3bad4cc5-c7a3-4d34-95ab-991545541eec" name="Default" comment="">
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.travis.yml" afterPath="$PROJECT_DIR$/.travis.yml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/package.json" afterPath="$PROJECT_DIR$/package.json" />
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/README.md" afterPath="$PROJECT_DIR$/README.md" />
     </list>
     <ignored path="$PROJECT_DIR$/.tmp/" />
     <ignored path="$PROJECT_DIR$/temp/" />
@@ -25,18 +24,6 @@
   <component name="ExecutionTargetManager" SELECTED_TARGET="default_target" />
   <component name="FileEditorManager">
     <leaf>
-      <file leaf-file-name="segment.js" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/classes/segment.js">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="281">
-              <caret line="123" column="7" lean-forward="false" selection-start-line="123" selection-start-column="7" selection-end-line="123" selection-end-column="7" />
-              <folding>
-                <element signature="e#0#44#0" expanded="false" />
-              </folding>
-            </state>
-          </provider>
-        </entry>
-      </file>
       <file leaf-file-name="test.js" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/test/test.js">
           <provider selected="true" editor-type-id="text-editor">
@@ -61,7 +48,7 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="package.json" pinned="false" current-in-tab="true">
+      <file leaf-file-name="package.json" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/package.json">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="200">
@@ -73,11 +60,21 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="README.md" pinned="false" current-in-tab="false">
+      <file leaf-file-name="index.html" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/coverage/lcov-report/index.html">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="170">
+              <caret line="10" column="57" lean-forward="true" selection-start-line="10" selection-start-column="57" selection-end-line="10" selection-end-column="57" />
+              <folding />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="README.md" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/README.md">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="952">
-              <caret line="59" column="26" lean-forward="false" selection-start-line="59" selection-start-column="26" selection-end-line="59" selection-end-column="26" />
+            <state relative-caret-position="476">
+              <caret line="67" column="22" lean-forward="false" selection-start-line="67" selection-start-column="22" selection-end-line="67" selection-end-column="22" />
               <folding />
             </state>
           </provider>
@@ -211,9 +208,9 @@
         <option value="$PROJECT_DIR$/classes/face.js" />
         <option value="$PROJECT_DIR$/classes/polygon.js" />
         <option value="$PROJECT_DIR$/test/polygon.js" />
-        <option value="$PROJECT_DIR$/README.md" />
         <option value="$PROJECT_DIR$/.travis.yml" />
         <option value="$PROJECT_DIR$/package.json" />
+        <option value="$PROJECT_DIR$/README.md" />
       </list>
     </option>
   </component>
@@ -233,7 +230,7 @@
     <handled-path value="$PROJECT_DIR$/node_modules" />
   </component>
   <component name="ProjectFrameBounds">
-    <option name="x" value="472" />
+    <option name="x" value="315" />
     <option name="y" value="36" />
     <option name="width" value="1750" />
     <option name="height" value="1006" />
@@ -275,25 +272,7 @@
               <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
             </PATH_ELEMENT>
             <PATH_ELEMENT>
-              <option name="myItemId" value="node_modules" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-          </PATH>
-          <PATH>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="flatten-js" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="flatten-js" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="node_modules" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="istanbul" />
+              <option name="myItemId" value="coverage" />
               <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
             </PATH_ELEMENT>
           </PATH>
@@ -307,15 +286,11 @@
               <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
             </PATH_ELEMENT>
             <PATH_ELEMENT>
-              <option name="myItemId" value="node_modules" />
+              <option name="myItemId" value="coverage" />
               <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
             </PATH_ELEMENT>
             <PATH_ELEMENT>
-              <option name="myItemId" value="istanbul" />
-              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
-            </PATH_ELEMENT>
-            <PATH_ELEMENT>
-              <option name="myItemId" value="lib" />
+              <option name="myItemId" value="lcov-report" />
               <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.PsiDirectoryNode" />
             </PATH_ELEMENT>
           </PATH>
@@ -660,7 +635,7 @@
       <workItem from="1490114298485" duration="32000" />
       <workItem from="1490114353316" duration="151000" />
       <workItem from="1490114755393" duration="13133000" />
-      <workItem from="1490134299983" duration="44303000" />
+      <workItem from="1490134299983" duration="45148000" />
     </task>
     <task id="LOCAL-00001" summary="some changes">
       <created>1487422880939</created>
@@ -921,7 +896,14 @@
       <option name="project" value="LOCAL" />
       <updated>1490558888006</updated>
     </task>
-    <option name="localTasksCounter" value="38" />
+    <task id="LOCAL-00038" summary="Integration with Coveralls">
+      <created>1490560345955</created>
+      <option name="number" value="00038" />
+      <option name="presentableId" value="LOCAL-00038" />
+      <option name="project" value="LOCAL" />
+      <updated>1490560345955</updated>
+    </task>
+    <option name="localTasksCounter" value="39" />
     <servers />
   </component>
   <component name="TestHistory">
@@ -957,10 +939,11 @@
     </history-entry>
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="211462000" />
+    <option name="totallyTimeSpent" value="212307000" />
   </component>
   <component name="ToolWindowManager">
-    <frame x="472" y="36" width="1750" height="1006" extended-state="0" />
+    <frame x="315" y="36" width="1750" height="1006" extended-state="0" />
+    <editor active="true" />
     <layout>
       <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.17932244" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
       <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
@@ -970,7 +953,7 @@
       <window_info id="Run" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.31050768" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
       <window_info id="Version Control" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32467532" sideWeight="0.49661538" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Structure" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
-      <window_info id="Terminal" active="true" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.36363637" sideWeight="0.49768057" order="7" side_tool="false" content_ui="tabs" />
+      <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.36363637" sideWeight="0.49768057" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Debug" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.47933885" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
       <window_info id="Favorites" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="true" content_ui="tabs" />
       <window_info id="Cvs" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
@@ -988,7 +971,6 @@
     <option name="myLimit" value="2678400000" />
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="Line class started" />
     <MESSAGE value="Some jsdocs" />
     <MESSAGE value="Link to doc" />
     <MESSAGE value="Added Box class" />
@@ -1013,7 +995,8 @@
     <MESSAGE value="Readme.md does not show on npmjs - try to fix" />
     <MESSAGE value="Completed polygon box, orientation, area methods" />
     <MESSAGE value="Integration with Travis" />
-    <option name="LAST_COMMIT_MESSAGE" value="Integration with Travis" />
+    <MESSAGE value="Integration with Coveralls" />
+    <option name="LAST_COMMIT_MESSAGE" value="Integration with Coveralls" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
@@ -1034,7 +1017,6 @@
     </watches-manager>
   </component>
   <component name="editorHistoryManager">
-    <entry file="file://$PROJECT_DIR$/out/index.html" />
     <entry file="file://$PROJECT_DIR$/docs/point.js.html">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="119">
@@ -1382,18 +1364,18 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/README.md">
+    <entry file="file://$PROJECT_DIR$/.travis.yml">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="952">
-          <caret line="59" column="26" lean-forward="false" selection-start-line="59" selection-start-column="26" selection-end-line="59" selection-end-column="26" />
+        <state relative-caret-position="42">
+          <caret line="2" column="8" lean-forward="false" selection-start-line="2" selection-start-column="8" selection-end-line="2" selection-end-column="8" />
           <folding />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/.travis.yml">
+    <entry file="file://$PROJECT_DIR$/coverage/lcov-report/index.html">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="42">
-          <caret line="2" column="8" lean-forward="false" selection-start-line="2" selection-start-column="8" selection-end-line="2" selection-end-column="8" />
+        <state relative-caret-position="170">
+          <caret line="10" column="57" lean-forward="true" selection-start-line="10" selection-start-column="57" selection-end-line="10" selection-end-column="57" />
           <folding />
         </state>
       </provider>
@@ -1408,5 +1390,13 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/README.md">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="476">
+          <caret line="67" column="22" lean-forward="false" selection-start-line="67" selection-start-column="22" selection-end-line="67" selection-end-column="22" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
   </component>
 </project>
\ No newline at end of file
diff --git a/README.md b/README.md
index 83cb1bb2..92cf0e28 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ The code is written using ES6 javascript standard.
     
 ![example](https://cloud.githubusercontent.com/assets/6965440/24111445/1310ceb4-0d9f-11e7-9775-2868ec5c4f21.png)
   
-View on requirebin http://requirebin.com/?gist=2bf8335f4655f103ba500b647e70f1fc
+Play with this code on requirebin http://requirebin.com/?gist=2bf8335f4655f103ba500b647e70f1fc
 
     // simple example of polygon
 
@@ -65,7 +65,7 @@ View on requirebin http://requirebin.com/?gist=2bf8335f4655f103ba500b647e70f1fc
 
 ![example3](https://cloud.githubusercontent.com/assets/6965440/24312130/3c56c9da-10e8-11e7-9461-3406525e0473.png)
 
-View on requirebin http://requirebin.com/?gist=8506659e6fa0876cda9cea15bfaf2dc9
+Play with this code on requirebin http://requirebin.com/?gist=8506659e6fa0876cda9cea15bfaf2dc9
 
 ## Tests