Upgrade gCommander (renaming it to jcommander-guice) to support JCommander 1.32 and all the API changes since.  Also adds prefix support and targets Guice 3.0.
Update readme, add direct injection of parameter classes, and break out the tests.
Merge pull request #1 from cgruber/update

Update jcommander-inject to use the more modern JCommander API
Move Guice integration into a sub-package