Use Standard Rubygems + Bundler

[mmmries]

What do people think of getting rid of our custom rubygems + bundler implementation? There is a standard mechanism now for getting a platform-specific version of a gem.

A lot of work has gone into bundler and rubygems that don't work under maglev (ie. having a path in a gemfile and using bundle exec can mess up load paths). Rather than finding and fixing all of the inconsistencies I wonder if it would be better to rely on the existing implementations and work with the popular projects to release version of their gems specific to maglev where needed.