Remove TODO note that no longer applies
Add ruby 2.0.0 to travis configuration

* Ruby 2.0.0 is 2.0.0-preview1, which is different from ruby-head
  which may be updated every 2 to 3 weeks.
* Reorder rubies to group similar ruby versions more closely
  together.
Merge branch 'master' into devtools

Conflicts:
	.travis.yml