change url regexp to handle discussions in coursenames with dashes

fixed recent threads & tags links

adding the ability to override the sidebar name

Blog link fix

Feature/fix backbone js

Add discussion coffee scripts to courseware js so we don't add a dependency on Backbone to non-courseware JS

Feature/bridger/new wiki

Forum refactoring/fixes

Feature/victor/better courseware errors

* hopefully won't come up, but if they do, our 500 page
  should be better than  HttpResponse("There was an unrecoverable error")

Conflicts:
	lms/lib/comment_client/utils.py
	lms/templates/discussion/mustache/_content.mustache

Quick workaround on syllabus_present that broke staging

additional firefox bug