Update grunt-contrib-watch to 0.5.3
Update grunt-contrib-watch to 0.5.3

Fixes issue where files added to an empty directory is not recognized.
kiwiupover/ember-weather,sajt/ember-weather,kiwiupover/seattle-auckland-weather,kiwiupover/ember-weather,grese/miner-app-OLD,mtian/ember-app-kit-azure,eriktrom/ember-weather-traininig,shin1ohno/want-js,tomclose/test_loading_problem,michaelorionmcmanus/eak-bootstrap,Anshdesire/ember-app-kit,aboveproperty/ember-app-kit-karma,ClockworkNet/ember-boilerplate,cevn/tasky-web,stefanpenner/ember-app-kit,tobobo/thyme-frontend,daevid/broccoli-todo,ClockworkNet/ember-boilerplate,jwlms/ember-weather-legacy,achambers/appkit-hanging-test-example,ghempton/ember-libs-example,tomclose/minimal_eak_test_stub_problem,lucaspottersky/ember-lab-eak,digitalplaywright/eak-simple-auth-blog-client,tucsonlabs/ember-weather-legacy,trombom/ember-weather-traininig,tobobo/vice-frontend,grese/miner-app-OLD,mtian/ember-app-kit-azure,digitalplaywright/eak-simple-auth,thaume/emberjs-es6-modules,lucaspottersky/ember-lab-eak,duvillierA/try_ember,teddyzeenny/assistant,sajt/ember-weather,ebryn/ember-github-issues,arjand/weddingapp,shin1ohno/EmberAppKit,stefanpenner/ember-app-kit,joliss/broccoli-todo,mharris717/eak_base_app,grese/btcArbitrage,tobobo/thyme-frontend,Anshdesire/ember-app-kit,mixonic/ember-app-kit