Update Build Resources branch (#1058)

- Update Apache parent version to latest
- Update Pom sort to latest
- Update Koraktor plugin to latest
- Ignore Intellij files

.gitignore

@@ -2,3 +2,4 @@
 /.classpath
 /.project
 /.settings/
+.idea

pom.xml

@@ -20,7 +20,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>18</version>
+    <version>21</version>
   </parent>
   <groupId>org.apache.fluo</groupId>
   <artifactId>build-resources</artifactId>
@@ -88,7 +88,7 @@
         <plugin>
           <groupId>com.github.ekryd.sortpom</groupId>
           <artifactId>sortpom-maven-plugin</artifactId>
-          <version>2.8.0</version>
+          <version>2.10.0</version>
           <configuration>
             <predefinedSortOrder>recommended_2008_06</predefinedSortOrder>
             <createBackupFile>false</createBackupFile>
@@ -103,7 +103,7 @@
         <plugin>
           <groupId>com.github.koraktor</groupId>
           <artifactId>mavanagaiata</artifactId>
-          <version>0.7.2</version>
+          <version>0.9.0</version>
           <configuration>
             <skipNoGit>true</skipNoGit>
           </configuration>