[umple compiler] quick fix, compiler generating java.util.data when not required.


git-svn-id: http://umple.googlecode.com/svn/trunk@4850 6ebf9d09-8eb1-0036-9d08-68c07d1b990a
reverting change while I add more test cases

git-svn-id: http://umple.googlecode.com/svn/trunk@4851 6ebf9d09-8eb1-0036-9d08-68c07d1b990a