SN-53 Create REST for login page
SN-51 Implement first version of login page
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/com/bionic/socialNetwork/rest/UserRest.java
 SN-54 registration logic create
 SN-55 create registration rest
SN-22 Added Group DAO and tests for groups
SN-22
1.mapped groups entities
2. added equals() and hashCode() methods to Groups objects
SN-22
1.mapped groups entities
2. added equals() and hashCode() methods to Groups objects
SN-22
1.mapped groups entities
2. added equals() and hashCode() methods to Groups objects
Add servlet api dependency
SN-22
1.Modified tests
2. added equals() and hashCode() methods to Groups objects
SN-22
1. Mapped UserGroup entity
2. Added test for UserGroup
 SN-60 session model add
Merge remote-tracking branch 'origin/master'
hibernate change mapping
Merge remote-tracking branch 'origin/master'