
Java: Update pom to use Java 1.7



Revision created by MOE tool push_codebase.
MOE_MIGRATION=6734


git-svn-id: 3f46d6ac2040cd462fa3667a3400c83a82e084d9@127 d537cd30-a800-f30c-cc8c-eaa9e1c31ce9

Khan/appengine-gcs-client,Khan/appengine-gcs-client,Khan/appengine-gcs-client