Added a test travis-ci file, plus a stub unit test
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.travis.yml:
* Add both compilers

makefile:
* Added conditional for CC (so you can choose any you want)
* Took out -Wno-incompatible-pointer-types

*.c:
* Explicit casts for functions
Merge pull request #3 from GBGamer/travis_ci

Travis-ci + Explicit Function Pointer Casts