updated ReadMe
add unit
Hangout API updated

Add comments .js and change localhost back to heroku link, update README
added and modified tests
added and modified tests
Merge branch 'iter2' of https://github.com/CS169-Virtual-Fitting-Room/VirtualFittingRoom.git into iter2
Change some jquery function back to normal javascript

Avoid unexplainable bug that jquery onchange functions do not respond
to selector’s drop list, hangout app now works with heroku and overlay
image can be loaded from it