Added the login controller.

Added the User content provider class to handel login system.
The url for login is /user/login
Expected parameters for login are user & pass
Minor Changes
	-Renamed DB package to com.mss.DAO
	-Renamed method varify in com.mss.DAO to varifyLogin
Merge branch 'master' of https://github.com/himeshsameera/smartshopping