added Travis CI config

this way feature branches and all pull requests get tested, which makes
it easier to accept pull request
Merge pull request #82 from patrickdet/travisci

added Travis CI config
Update README.md
Update .travis.yml
Install hex for travi
Update .travis.yml
Update .travis.yml
Update README.md
Do not set MIX_ENV for travis
Fix routes task. Router not longer lives in App.Config module.
Merge pull request #83 from phoenixframework/df/routes-task-fix

Fix routes task. Router not longer lives in App.Config module.
WIP Add Topic Supervisor/Server to fix race conditions and add failover
Buffer topics/timers for cleanup to improve performance and limit unneeded timers
Add Topic.GarbageCollector
Merge branch 'cm-topic-refactor' of github.com:chrismccord/phoenix into cm-topic-refactor