SDL2 support#8

Merged

fredbcode merged 10 commits intofredbcode:masterfrom

sergiobenrocha2:master

Mar 23, 2015

Commits on Mar 20, 2015

Commits on Mar 21, 2015

Fix leak in sdl_wrapper, update SDL info in README.
sergiobenrocha2
committed

Commits on Mar 23, 2015

Added support for event filter (needed to ignore SDL_TEXTINPUT from keyboard), fix SDL_PollEvent call (it was called once per frame), some cleanup.
sergiobenrocha2
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Merge pull request #1 from sergiobenrocha2/SDL2
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