Make Travis-CI work

Add .travis.yml for Travis-CI settings
  - Update xctool
  - Build project
  - Notify #bitcoinswift IRC

xctool/xcodebuild cannot automatically create schemes so these changes are necessary
  - Disable "Autocreate schemes"
  - Make schemes shared
  - Add schemes to repo
Merge pull request #8 from jsambuo/add_travis-ci

Make Travis-CI work