* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* response format changes
* Generated mocks
Fixed all references of Preferences.Save
* Remove old code from store.go (incorrect merge)
* Review change - Add validations on count and error
* Review change - return from root level
* Review change - return 0 as nil value for int
* fix initialisation of err in preference_store
