Initial Travis configuration file.

Just define the language at the moment...
Build using Facebook's xctool.
Added Travis build status.
Build the release configuration, run it on the simulator and run the tests.
Update the Travis build configuration now Travis have updated their OSX VM's
Is it upset about the #'
Create a shared scheme. When using Travis we can't rely on Xcode doing this for us.
Change the Travis branch.
Merge pull request #51 from TuftEntertainment/Travis

Get #Warrior building on Travis.
Merge branch 'SpriteKit' of https://github.com/TuftEntertainment/hashtag-warrior into SpriteKit