Development - Watch for JS/LESS changes and compile once a file is saved

To be tested on windows and linux. Run npm install to get updated grunt requirements Run grunt watch and change many different files (amd js, yui js, bootstrapbase .less} files and ensure they are rebuilt correctly Do things like update two files at once and ensure the same works [not applicable to windows MDL-50115] Run grunt in an amd directory and ensure it only runs the amd building on the affected files [not applicable to windows MDL-50115] Run grunt shifter in various yui directories (e.g. lib/yui/src/formautosubmit , lib/yui/src (etc) and ensure it only runs the yui building as you'd expect Try some exploriory testing of the grunt functionality and ensure it all continues to work correctly/as before