Revert "Give response back to the main thread on api calls"

This reverts commit 576bcb9f4b389d271da6a88addb50405c8f21dff.

Conflicts:
	couchpotato/api.py
Release api lock on connection close or finish

fix #4372
IOLoop callback hanging
Add robots.txt
Return false if no media is found on try_next

fix #4345
SCC not finding seeders
Notificaton.list not returning anything

fix #4348
Merge branch 'develop' into redesign