Add Ruby 2.1.0 and rbx to .travis.yml.  Add required Rubinius gems.
Droping support for ruby 1.8
Merge branch 'feature/add_2_1_0_and_rbx_to_travis' of https://github.com/petergoldstein/aruba into petergoldstein-feature/add_2_1_0_and_rbx_to_travis

Conflicts:
	.travis.yml