The rebuild plugin now copies the causes of the original build into the new build. Besides the original causes, a UserIdCause is added for the user who started the rebuild action.
A test is added to check that the causes are copied.
Changed copyright from 2012 to 2013
Improved the copy / replace of UserIdCause.
If a UserIdCause is present, it will be replaced with the person triggering the rebuild. If not, then a UserIdCause will be added. This prevents multiple occurrences of UserIdCause.
Resolved Conflict (I forgot to track the remote branch):
	src/main/java/com/sonyericsson/rebuild/RebuildAction.java
changed back the license
Merge pull request #6 from rinokadijk/master

Rebuild plugin should copy the causes of the original build to support rebuilding pipeline builds