Fixes #2262. Crashed with input html plugin.
Improved bootstrap error message.
jsonschema 2.3.0 support fix #105

See https://pypi.python.org/pypi/jsonschema/2.3.0, and how it is fixed for built in jsonschema formats https://github.com/Julian/jsonschema/commit/c763ab974c36891e2b8bcb6a6c1ebb1dd84009b6
Merge branch 'master' into cli_subcommands

Conflicts:
	flexget/config_schema.py
est_released cleanups
Deprecate api v1
Remove some broken code
Break IPC while I work on authentication.
Finish implementing ipc auth
Oops, missed a spot
Add a version system to the ipc protocol
Add handler for SIGTERM in daemon mode
Make rpyc use our ipc logger
Only run the manager.upgrade event if needed.
Make sure there is a database lock before running the upgrade event.
Make sure to close the session.
Don't count 'already in queue' as a failure with queue_movies plugin.
Don't count 'already in queue' as a failure with queue_movies plugin.
Add discovered_from and discovered_with fields to entries created by discover plugin
Merge branch 'master' into cli_subcommands
Fixed an issue with logging crashing.