Conflicts:
	lms/urls.py

Feature/victor/metadata inherit

Conflicts:
	lms/templates/discussion/_forum.html
	lms/templates/discussion/_inline.html

* problem was on import to json--got all the metadata,
  but didn't preserve the _inherited_metadata
* added own_metadata property, use it instead

* also make a placeholder roundtrip export test

* make logging work properly in cms, dev
* fix a comment