Fix Bundler and RubyGems for relevant versions.

Temporarily remove working Ruby versions.
More artisanal shell script.
Fix shell syntax. I have no idea how shell works.
It's /dev/null
Add gems specific to Rubinius.
Bring back all the Rubies.
Make it rbx rather than rbx-2.2
Merge pull request #10 from travis-ci/mm-fix-broken-builds

Fix broken Rubies