Change artifactId to the normal scala version naming convention
Change artifactId to the normal scala version naming convention

Right now the artifactId includes the full scala version in it, eg
scalagen_2.9.3, scalagen_2.10.1, etc.
This was the convention for 2.9.x, but for 2.10+ the convention is to
only have the major/minor scala version, eg scalagen_2.10.

timowest/scalagen,timowest/scalagen,mysema/scalagen,mysema/scalagen