Supply our default configuration for maven-release-plugin (autoVersionSu...

...bmodules, tagNameFormat, pushChanges)

So `autoVersionSubmodules` and `tagNameFormat` probably don't need discussion as the defaults are odd, but how do you guys feel about `pushChanges`?

http://maven.apache.org/maven-release/maven-release-plugin/prepare-mojo.html#pushChanges

Since we moved to git, we will now be able to verify the changes locally and only then push + release. 
WDYT?