Updated bootstrap from 2.2.2 to 2.3.1
Compressed jquery-ui files (for agenda config).
Fix typo in assignment.
Insert new app to upload files via the frontend. Let tornado server media files. Insert icon-mediafile css class. Insert extra_stylfiles context variable.
Small modifications. Enhencement of tests.
Change order of classes for User and Group
Merge pull request #570 from emanuelschuetze/master

Updated bootstrap and jquery-ui compressed files
Insert whitespace. Fix docstrings.
Merge pull request #572 from normanjaeckel/Fileupload_3

Mediafile (new)