Update to Django 1.6
Fixed #957 (Allow list-style in CKEditor)

Allowed additional css styles 'color' and 'background-color'
for span html fields in ck-editor (and bleach).
Merge pull request #1018 from emanuelschuetze/fix957

Extend css style optinos in CKEditor
add missing license html6lib-python
Merge pull request #1020 from DerPate/fix_licens

Add html5lib-python license.
Template improvements.

- motion detail template: Fixes motion manage state template block.
- mediafile list template: Fixed missing activeline class.
- item detail template: Fixed is_active_slide conditions.
- assignment view template: Use bottongroup instead of single radio buttons.
- Projector template: Updated header and countdown style. Removed footer.
- Added config options to show logo and/or title/description.
- Projector template: New config options to set background color and font color for projector header.
- Make WLAN form labels not translateable.
Merge pull request #1019 from emanuelschuetze/several-1.5-fixes

Template improvements and translation strings
Some more template fixes:

- Fixed #992 (Use correct countdown format)
- Fixed #909 (Backend und projector template style)
  * Search bar with same border-radius like login button.
  * Projector: Fixed overlay message style. Allow HTML code (use template filter 'safe').
  * Dashboard: Tooltips, Buttons and Widget fixes.
- Fixed template does not exists error if custom slide is activated.
- Countdown: Add css to show negative countdown in red.
- Add missing translation strings to English po file (for transifex).
Merge pull request #1009 from emanuelschuetze/1.5c1-fixes

Template fixes
Update English translation files.
Merge pull request #1001 from ostcar/django1.6

Update to Django 1.6
Merge pull request #1026 from normanjaeckel/EnglishTransFile

Update English translation files.