Merge pull request #75 from bvssvni/master

Added rust-sdl2_ttf as dependency
Updated .travis.yml to build SDL2-TTF
Merge pull request #76 from leonkunert/master

Updated .travis.yml to build SDL2-TTF
Updated README to show new dependency SDL2-TTF
Merge pull request #78 from leonkunert/master

Updated README to show new dependency SDL2-TTF
Upgraded

* Needed a force push to the rust-sdl2 fork