Update CONTRIBUTING with 'grunt watch'
Update CONTRIBUTING with 'grunt watch'

nimbl3/candy-chat-handlebars,mojolingo/candy,SweetFruit/Game,bklang/candy,SweetFruit/Game,candy-chat/candy,korobochkin/candy,who/candy,cmnisal/candy,candy-chat/candy,cmnisal/candy,csusantha/candy,SweetFruit/Game,candy-chat/candy,csusantha/candy,who/candy,csusantha/candy,cmnisal/candy,who/candy,korobochkin/candy