Initial SDL 2.0.1 merge. Windows tested OK. Android will crash when returning to the application.
Fixed Android GL context destroy / restore. Removed project.properties file, as it's generated by the command "android update project".
Fixed exiting on Android.
Fixed black window on subsequent application starts on Android. Removed GL synchronization before swapping buffers, which should be unnecessary.
Merge branch 'master' into sdl-update
Fixed Raspberry Pi error (could open Window).
Fixed event handling for Raspberry Pi.
Updated documentation on additional Linux software package for RPI.
Reenable the function for RPI since new video driver support mouse.
Fixed mouse motion spin bug.

This bug only manifests itself when the SDL video driver has "WarpMouse" function implemented, like RPI video driver, in conjuction with call to SDL_SendMouseMotion() with relative event position.
Fixed runtime issue on Raspberry Pi with Pidora as OS.
Revert back to no-ops for Input::SetMouseVisible() on RPI.

The OS cursor on Raspberry Pi does not behave like other OS cursor on other platforms.
Add Android auto-generated project properties to .gitignore.

Also, do not create symbolic link to project.properties anymore.
Merge branch 'sdl-update'