emcc --clear-ports option
link to youtube video of cppcon talk
sdl_image integration
mention each port once in each process
enable all passing sdl2-image tests
Make tools/emterpretify.py import-safe by only executing itself "if __name__ == '__main__':". On Windows when using Python multiprocessing, the child processes will import the main module at launch. This means that any module that uses multiprocessing needs to be importable as a library without executing its 'task'. For reference, see http://stackoverflow.com/questions/18204782/runtimeerror-on-windows-trying-python-multiprocessing . Fixes a bug where a Windows system would hang when running emterpretify.py due to creating an avalanche of thousands of python processes.
mention ports, and document both kinds of SDL support, 1 and 2
fix sdl*_canvas_twice tests, and enable in sdl2
Merge pull request #2903 from juj/fix_emterpretify_fork_bomb

Fix emterpretify.py fork bomb.
clean up deprecated emscripten_set_network_backend; fixes #2899
comment on test_sdl2_canvas_proxy
use Browser.doSwapBuffers in egl
enable fixed test_sdl2_canvas_proxy
add proxy test for sdl2+gl