Support of nested namespaced URLconfs in hooked apps.
Also added ability to exclude some namespaced URLs from cms_perms decoration.
Don't set namespaces in first level of nested URLconfs.
Added test case for exclude_permissions feature of CMSApp.
fix plugin permissions for child plugins on apphook pages
Improve navigation & structure of documents

Presently, the new RTD contents list in the sidebar is more or less unusable:

https://www.dropbox.com/s/bl36v087cza6r7v/Screenshot%202014-07-14%2014.48.21.png (image)

The new version looks like:

https://www.dropbox.com/s/soiv9iq4vss1v9k/Screenshot%202014-07-14%2014.49.50.png

The expanded table of contents still appears in the main index page.

conf.py has also been updated to use the new RTD theme locally, if the user has it installed; if not
it will use the built-in theme as usual.

Also includes miscellaneous minor corrections.
Backports documentation restructure from develop

Commits:

52a480beec529955cf2ebbd618666520c238ad39
ea6e46ef874a76b9eebd8d7de8db6782f1d01806
Merge pull request #3307 from evildmp/documentation-backport

Restructure documentation and improve contents tables (backport)
Fix docs building
Merge pull request #3313 from yakky/feature/fix_docs_master

Fix docs building on master
removed duplicated code from #2875
use placeholder for permission checking in render_plugin tag
Refactored code that checks settings and dependencies
Updated docs

I added a warning about returning non-utf8-encoded strings from within ``def __unicode__()``, as I found it resulting in a 500 response and a plugin instance marked as <Empty>. After returning as UTF8 everything worked as expected. If you can't confirm these issues to be related or feel that the addition doesn't make sense for documentation readers, feel free to drop it.
Use cms.utils.compat.dj.is_installed to check for installed apps
Check for cms.middleware.multilingual.MultilingualURLMiddleware
Fix location of breadcrumb template in docs

`breadcrumb.html` is actually located in `menu`, not `cms`.
Merge pull request #3369 from derek73/patch-1

Fix location of breadcrumb template in docs
Fixed comment
Alias plugin fix for CMS without multilingual support
Merge pull request #3363 from sthzg/patch-2

Updated docs