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)
New feature: qr-code for system url on participants password pdf.
(Note: New dependency! Run 'pip install qrcode')

Fixed pep8 issues. Create qr-code image for system url one time only.

New feature: qr-code for system url on participants password pdf.
(Note: New dependency! Run 'pip install qrcode')

Fixed pep8 issues. Create qr-code image for system url one time only.

Print qrcode image from StringIO stream.
Adapted table stylesheet for better integration of reportlab's Image object.

Fixed pep8 issue.

Made qrcode import as optional feature. Fixed pep8 issue.
Merge pull request #571 from emanuelschuetze/qrcode

New feature: qr-code for system url on participants password pdf.