Removed Required constraint for device_type in Feedback model
Created form for submit feedback from browser(For testing)
changed Rating field type from float to double in database
Added uadetector-resources dependency
Implemented Receiving  Device details along with Feedback
Solved problem in storing empty rating
Handling Exceptional cases while use don't want to send his device information
Made api_key as a Parameter instead of Header field
Merge branch 'feedback-webservice'
Replaced Login with Logout in Application Header
implemented basic functionality for creating New Channel