Added NSSupportsAutomaticGraphicsSwitching key to Info.plist to avoid triggering the discrete GPU switching

Core Animation triggers the use of discrete GPU in the dual-GPU MacBook Pros.

http://developer.apple.com/library/mac/#qa/qa1734/_index.html#//apple_ref/doc/uid/DTS40010791
Merge pull request #116 from eldenchen/patch-5

Added NSSupportsAutomaticGraphicsSwitching key to Info.plist to avoid triggering the discrete GPU switching