bugfix: Aviod lockup when date is not set
Fixed an embarrassing merge error from waaay back. Didn't disrupt operation but caused funny error messages in the log.

Thanks to @nophead for reporting this.

Closes #433
Create CONTRIBUTING.md
Bug fix for Emergency Stop
Merge pull request #475 from Salandora/master

Bug fix for Emergency Stop
so we can use netstalk
detect current network
checking for network passwords
handle wrong password
detecting network connection
some nagging bugs fixed
Insert src folder at first position of sys.path
Insert src folder at first position of sys.path
Merge branch 'master' into devel

Conflicts:
	src/octoprint/server/ajax/control.py
Versioning by versioneer: https://github.com/warner/python-versioneer/
About time to declare this as a stable version, should have done this ages
ago...
Merge branch 'master' into devel

Conflicts:
	setup.py
Removed left overs from old VERSION tracking
(cherry picked from commit 603f667)
Fixed setup.py to correctly work with versioneer
Added clean command to setup.py