Merge pull request #283 from TelekomLabs/enforce_message_strings_for_json

force message buffers to strings before decoding
Merge pull request #284 from TelekomLabs/add_insecure_switch_to_docs

add --insecure to runserver docs
Merge pull request #285 from TelekomLabs/force_pickle_serializer

force pickle session serializer (workaround for django 1.6+)
let workers exit gracefully

Conflicts:
	worker/worker.py
add "Worker exiting." message to test mocks