Show suggestion on the 404 page
use slug
add tests for helpful 404 page
separate getting suggestion logic from error handler
handle fallbacks in URL dispatcher
remove unused import
Move vagrant settings to separate file

* Doesn't clobber local_settings which may exist from a standalone instance
Merge branch 'master' into feature/rich404

Conflicts:
	readthedocs/templates/404.html
load core_tag
fix doc_url tag to return a valid URL
add tests for doc_url tag
doc_url tag supports singlehtml
Add translated files.
Update tx config.
Add compiled mo files for Sphinx.
Bump theme
don't throw KeyError when "scaled_project" is missing
In vagrant, run gunicorn with vagrant settings.

Closes #715.
Merge pull request #722 from toffer/issue-715-vagrant-settings-separate-file
Merge pull request #721 from qrees/scaled_project

don't throw KeyError when "scaled_project" is missing