Revert "Hide the /uptime endpoint in the docs."

This reverts commit 477f39a0009d943a201f3d82567d336de8487885.
Require models and amqp explicitly
Require travis/testing explicitly
Bump travis-core and travis-support
Require states_cache explicitly
Use ruby 2.0.0
Merge branch 'master' of github.com:travis-ci/travis-api

Choose remote

Conflicts:
	Gemfile.lock
WIP: Atom feed for /repos/:owner_name/:name/builds

See travis-ci/travis-core#82

TODO: Link to indivisual build.
TODO: Add specs.
TODO: Review `#apply?`
Use here-doc for Atom feed template

Rather than unnaturally re-reading __FILE__ and splitting,
use a here-doc to clarify the intent.
(Should also consider splitting it to a file.)