Add .travis.yml.
Add .travis.yml.

So that every PR would be tested.

IBAnimatable/IBAnimatable,IBAnimatable/IBAnimatable,IBAnimatable/IBAnimatable,alexiosdev/IBAnimatable,JakeLin/IBAnimatable,JakeLin/IBAnimatable,seanwoodward/IBAnimatable,alexiosdev/IBAnimatable,seanwoodward/IBAnimatable