Matt, Matt, Matt. That was never gonna work.
Fix default image.
Revert "Allow send_file to guess the mime type"

This reverts commit 96f938cff81f2f3431b76991c5987a8c5cb7bf70.
Revert "Revert "Allow send_file to guess the mime type""

This reverts commit 8d6f8f8febc4f00bec3a4092e32b6b8dc86cbac6.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lolcommits_server/serve.py