Bring back Java 1.7 source target config changes that got reverted with my branch commits.

git-svn-id: https://hyracks.googlecode.com/svn/branches/fullstack_asterix_stabilization@3038 123451ca-8445-de46-9d55-352943316053
57 files changed
tree: 8a8cc7e6fb673e366a84e3e7d5792ef18872bc5d
  1. algebricks/
  2. hivesterix/
  3. hyracks/
  4. pom.xml
  5. pregelix/