added the backend for maintenance mode
Adds the frontend for maintenance mode
sending 503 http code
not depending on site's theme for maintenance mode theme now
removes foot since that can have javascript in it
added support for IE7
Allows changing the message independent of the mode. Clearer implication of mode. Label usage.
Indicators of maintenance mode in the headers
Merge pull request #10 from mrclay/pr5783

Additions to maintenance mode
moved warning about who can view site to instructions
rejects action attempts by non-admins including logging in
display of maintenance mode warning should be independent of what menu it is
adding ie7 class through JavaScript
made maintenance theme match wysiwyg editor results and fixed bug with action check
matching the css name to view name
Merge pull request #5783 from cash/maintenance

Fixes #4645 Maintenance mode