Update gems so bundling works again

I tried to bundle and the fork of ratom we were using doesn't exist anymore... luckily, [the patch we were using a fork for was merged into master about a year ago](https://github.com/seangeo/ratom/pull/27) so I switched back to a released version.

Then libxml wouldn't install, so I forced that to upgrade, then ostatus complained so I upgraded that too. Bundling works for me now.