Update idea plugin version

We are using a quite outdated version (2.0). The most recent idea plugin release is 2.2.

Index: jackrabbit-parent/pom.xml
===================================================================
— jackrabbit-parent/pom.xml (revision 802755)
+++ jackrabbit-parent/pom.xml (working copy)
@@ -73,7 +73,7 @@
<plugin>
<!-- http://maven.apache.org/plugins/maven-idea-plugin/ -->
<artifactId>maven-idea-plugin</artifactId>

• <version>2.0</version>
  + <version>2.2</version>
  <configuration>
  <downloadSources>true</downloadSources>
  <jdkLevel>1.5</jdkLevel>