Will only receive one file if --stay-open isn't True

Added a way to shutdown onionshare without ^C (maybe we could forward to this address/send a request with the code in the request body?)

Receiver mode and sending mode cannot be run at the same time. However one of them needs to be set to True for onionshare to run
Merge branch 'receiverMode'

Conflicts:
	onionshare/onionshare.py