Added ajax to check user name
Mail Module added

changes are done to SignupController and a new package Mail has been
added to the project
Merge remote-tracking branch 'origin/master'

Conflicts:
	nbproject/private/private.properties
	nbproject/private/private.xml
Merge branch 'master' of https://github.com/swarup-donepudi/LinkedU

Conflicts:
	nbproject/private/private.properties
	nbproject/private/private.xml
	src/java/controller/SignupController.java
	web/index.xhtml