Update Rakefile.
Update Rakefile.

chicisimo/PEPhotoCropEditor,mr-v/PEPhotoCropEditor,kishikawakatsumi/PEPhotoCropEditor,BluechipSystems/PEPhotoCropEditor,yangmie/PEPhotoCropEditor,wonderkiln/PEPhotoCropEditor,Adorkable-forkable/PEPhotoCropEditor,kiwamunet/PEPhotoCropEditor,KaterinaPetrova/PEPhotoCropEditor,david90/PEPhotoCropEditor,imjerrybao/PEPhotoCropEditor