[BUGFIX] Escape slashes missing in ext_autoload.php
[FEATURE] Added backend module for backend user group management
[BUGFIX] Bad return URL in backend user group module
[BUGFIX] Removed access restrictions from backend groups
[BUGFIX] Bad edit URL for backend user groups
[FEATURE] Added file mount administration module

File mount administration module. Contains listing, paging, detail view and
filter options.
[FEATURE] Added filter to backend groups module

Allows for filtering by group title.
[TASK] Updated module icons

Updated module icons to match those used by TYPO3 by default.
[FEATURE] Added dynamic module menu to backend user module

This will make it easier to extend the current module with extra features
[TASK] Added .gitignore
[TASK] Fixed code formatting and style

- PHP: all tabs
- Added missing spacing between document comments and class comments
- Moved all namespace includes to top of documents
[BUGFIX] Fixed action menu default label for backend user module

Default labels were not set, and the compare action didn't have a dynamic
menu yet.
Merge pull request #1 from SebastiaanDeJonge/master

Added backend module for backend user group management