Ignore *.gem.
Ignore *.gem.

Now, after you build, install, and test the code, you can run "git
review reset" to get back on master without manually removing the
built gem first.

Change-Id: I8236dda2b2d0f99c2bf3827631481ce30b694388
Reviewed-on: http://review.engineyard.com/214
Reviewed-by: Andre Arko <84de7f247766c9f87e4737d92fee235e10beaf0d@engineyard.com>
Tested-by: Andre Arko <84de7f247766c9f87e4737d92fee235e10beaf0d@engineyard.com>

cowboyd/engineyard,radamanthus/engineyard,engineyard/engineyard,radamanthus/engineyard,engineyard/engineyard