Configurable backend content listings.
Moved custom listing templates form /app/config/view to /app/view/custom/
Merge pull request #747 from xiaohutai/master

Feature: allow previous and next to filter by "where" queries
Remove default. Fixes #745
Added some methods to manipulate users' roles.
Added nut commands to add or remove a role from a user.
Check for a 'root' user. If not present, promote the current logged in user.
Typo.
Fixed Typo + Undeclared variables within cache getters.
Merge pull request #750 from doertedev/master

Fixed Typo + Undeclared variables within cache getters.
Added Code comments to render.php
Merge branch 'master' of https://github.com/bolt/bolt

Conflicts:
	app/src/Bolt/Render.php
Tweaks and fixes for 'roles and permissions'.
Tweaking the "stack" -> handle "files/files/" better.
removed unneeded statement.
Make the 'changelog' use 'ownerid'. Show username for 'id' in lastmodified. Fixes #751
Working on caching. Pretty happy with the results, so far. :-) See #434
Whitespace
Added a few more neccesary mimetypes
There's a nasty issue in the way we use Twig's Loaders. This is a partial solution, we'll need to fix it properly.