Add support for "Import With Maven" function.

[brettryan]

While the Git option appears in the standard create plan wizard it does not exist in the "Import With Maven" function in Bamboo 2.6.

[krosenvold]

Unfortunately this feature is not open for plugin developers yet. We'll see what happens in later versions

[krosenvold]

http://jira.atlassian.com/browse/BAM-6646 Shows how to do this if anyone is interested in making a patch