Warn if the CAN bus mapping is missing speed.
Document that only 0x101 and 0x102 are accepted as bus addresses.
Remove misleading docs about using output of xml_to_json for code generation.
Remove outdated default arguments to xml_to_json.
Update to 2.1.2.
Merge commit '136731c'

Conflicts:
	docs/definitions/mappings.rst
Bump to v2.1.3.
Merge remote-tracking branch 'origin/master' into next

Conflicts:
	CHANGELOG.mkd
	README.rst
	docs/conf.py
	docs/index.rst
	src/main.cpp