Add nginx reverse proxy to apache in Vagrant VM

Accessible at port 9001.
Add gunicorn to Vagrant VM
Automatically start dev server in Vagrant VM
Docs: Explain changes to Vagrant VM
Filter by date range in Dasboard/Reporting, if provided
Filter different reports properly
Use RTD theme locally
Use Napoleon Sphinx extension
Configure settings for docs using test function (not sandbox)

This avoids a pesky autodoc import issue that the debug toolbar creates when it
patches the URL conf.  It was preventing the EventHandler class from
being loaded via autodoc.  This fix solves that issue.
Improve core functionality docs

Now using Napoleon :)
Add release note for 0.5.3
Remove dead fields from phone number functionality
Document new model fields for release notes

Plus ensure the copyright notice is correct for the modified phone
number work.
Update deprecated features notes in release notes
Correct a few references in availability/prices doc
Update translation files from Transifex
Bump version to 0.6
Revert to using sandbox settings (but without debug toolbar)

This reverts ac7e8ee
Fix pyflakes error for line length
Add IRC channel to README

The #django-oscar channel has been in operation for some time.