Issue 417 -- a commit with the implementation of the specialization of associations in Java. Includes testbed tests for the compilation of specializations. Also includes the spec_generator.skeleton (a skeleton for separating the load of the JavaClassGenerator), and the JavaSpecGenerator itself. 


git-svn-id: http://umple.googlecode.com/svn/trunk@4833 6ebf9d09-8eb1-0036-9d08-68c07d1b990a