Add libsdl2 dependencies
Add branch 'feature/travis/jeff' to whitelist
Fix sdl2 ppa
Introduce SDL_BOOL helper function
Fix color key support -- yay!
Decouple Coords::SDL (relocate to SDL_compat.hpp)
Decouple SDL::Rect, SDL::Color

* Relocate to SDL_compat.hpp
Remove icon.bmp

* Not needed now that we can load PNGs from both OSes :)
Introduce methods: blend_mode, set_blend_mode
Introduce method overloads: RGB & RGBA
Major refactoring of Texture class

* BitmapFont class is alive and well!
* nom::Texture is nearly complete -- a strong, rewned foundation lies
ahead!

    The beginning of the end is nigh!
Reflect the changes within nomlib for app example
Combine app source files (*.cpp|*.hpp)

* Why not? :P
Bit of clean up of SDL1 codebase
Use nomlib's portable integers
Rename of SDL_compat to SDL_helpers[.cpp|hpp]
Use class getters when possible
Use font label features of nom::MessageBox

(No support for TTFs just yet)
Fix bug & introduce new command

* Do not delete CMakeFiles directory; this causes cmake to rebuild the
whole project

* Introduce rebuild command; one less command to type -- yay!
Bit of clean up

* Use SDL_SetHint in app example, instead of in the set_viewport method