added group controller
added functionality to get all groups and join a group
added abstract class with common method for controller
renamed CenterDeviceLoginController to LoginController
Merge branch 'join-group'
added group controller tests
clean up: removed unused rootconfig class
clean up: removed unused persistence properties and dependencies
clean up: removed unused spring security context configuration file
clean up: removed unused logger configuration file
clean up: removed unused aspectj dependencies
added first cors filter test
updated groupcontroller test
Merge branch 'testing'
added document download tests