pom formatting
fix: fix group-id 

we changed the project group-id, forgotten the assembly

Change-Id: I5fe16552e4f15e3a5b84c7a66bfec9d6877b24eb
Switch to java 7

Use java 7 for the project

Change-Id: I4a739c4c01b289eb0e1cea2a775633ca4ca213e7