fix(smartTable/editableTable): fix last column arrow

Close akveo#57

src/app/pages/tables/widgets/editableTable.html

@@ -1,13 +1,15 @@
 <div class="horizontal-scroll">
   <table class="table table-hover" st-table="editableTableData">
-    <tr class="sortable header-row">
+    <thead>
+    <tr class="sortable">
       <th class="table-id" st-sort="id" st-sort-default="true">#</th>
       <th st-sort="firstName">First Name</th>
       <th st-sort="lastName">Last Name</th>
       <th st-sort="username">Username</th>
       <th st-sort="email">Email</th>
       <th st-sort="age">Age</th>
     </tr>
+    </thead>
     <tr ng-repeat="item in editableTableData" class="editable-tr-wrap">
       <td class="table-id">{{item.id}}</td>
       <td><span editable-text="item.firstName" blur="cancel">{{item.firstName}}</span></td>
@@ -18,7 +20,7 @@
     </tr>
     <tfoot>
     <tr>
-      <td colspan="6" class="text-center">
+      <td  colspan="6" class="text-center">
         <div st-pagination="" st-items-by-page="12" st-displayed-pages="5"></div>
       </td>
     </tr>