Merge pull request #35 from ysb33r/master

Added JRubyPrepareGemsSpec. Fixed transitive dependencies for GEMs.
Refactor some code out of JRubyPlugin and create a JRubyWar task

Fixes #24
Begin implementing the JRubyJar task

This is still a work in progress but is enough to at least produce a broken archive :P
Towards ISSUE #42. Placed some config back into jrubyWar & jrubyJar
Towards ISSUE #42. Moved webInf into copy()