Current template when built and installed was not actually showing up in
Processing Modes drop-down. Found out (after much hair-tearing) that
this is because lib.name in build.xml was not the same value as the
subclass of JavaMode.

Fixed this problem, and updated the readme to help other people who run
into this problem. 

Tested in Processing 2.0.3.
Merge pull request #2 from zlot/master

Fixed problem with template not actually appearing in Processing Modes drop-down when built and installed.