[gem] add state_machine
add migration for state in supports
add state machine logic
controller end point for acknowledging supports
make finish button a bit more universal
remove done column from supports

logic remains in state field
use state machine in finish_support service

still not sure it’s the best possible way
rollback and remove migrations
remove state machine
replace acknowledged with discussed
acknowledge support service
back to dealing with support on service-level
in the name of clarity!
simplify discussed method
Merge branch 'master' into add_help_state

Conflicts:
	app/controllers/supports_controller.rb
Merge pull request #18 from netguru/add_help_state

add ability to acknowledge help request