Update to 1.9.12-git-beta2

Redundancy 1.9.12 Changelog
===========================
Bugfixes
========
- Fixed a bug causing an internal warning
- Fixed a bug (#31) which caused wrong display of the transparency
channel of a PNG file
- Fixed a bug causing an internal warning at the changes module
- Fixed a bug causing a wrong calculation of a storage when 1024*1024
Bytes large
Feature additions/ Improvements
===============================
- The changes page now display's the kind of the entry (changed or new
entry)
- Added a guard module to check filesystem operations before they get
executed
- Added new upload module using Dropzone.js
- Added support to store data on a external drive
- The file dialog displayes now an shortened displayname if too long
- Added new user setting to control if keyboard shortcuts should be used
- Added setting Program_Upload_Module to enable or disable the new
upload module (old: upload, new: upload2)
Features removed
================
- Removed share feature for base dir ("/")