DATACOUCH-22: Add plugin repo to be able to resolve bundlor.maven plugin

The build fails on my local machine due to the
com.springsource.bundlor.maven plugin not being available in any public
know maven repo and also non project configured maven repo.

Corrected indentation of pom file for readability

Some more housekeeping. The expression ${groupId} is deprecated. ${project.groupId} should be used instead.