Certificates: Add regeneration command

* Adds regenerate_user command, which lets you run certificates for one
  particular user in one particular class, regardless of whether they
  have a pre-existing certificate.
adding STATIC_ROOT
adding STATIC_ROOT to cms
Use known translation if exists to get groupname
password reset pages use Django templates, not Mako
Release email script: use --no-pager
Add neglected entries
Use known translation if exists to get groupname
Merge pull request #1435 from edx/rc/2013-10-23-fixes

release candidate improvements
Test that instructors can access courses
Remove as_old_location methods
They were incorrect if there were periods in the org or name.
use bleach instead of lxml.html.clean for sanitize_html OEE
Merge pull request #1434 from edx/dhm/bug_has_access

Use known translation if exists to get groupname
Parse urls in one regex w/ more consistency
Don't mix versions in same object:
VersionConflictError just has version as 2nd arg
Routines wanting to create an up-to-date locator shouldn't count on constructor to override version
Fixed a bug where legacy instructor dash's email editor failed to load
Have urls.py fully parse locator url
Merge pull request #1416 from edx/dhm/regex_courseid

Parse locator url better
Convert checklists to new URL scheme.
Do need context_course variable for segment io.