Insert new feature: attachments for motions.

Fixed #522. Database struture changed.
Merge pull request #908 from normanjaeckel/MotionAttachment

Insert new feature: attachments for motions.
New feature: couple countdown with list of speakers

'Begin speach' button starts countdown, 'end speach' button stops countdown.
Clean up main.py and move code to __main__.py and utils/main.py.
fix gui/portable for pull request #903
Some changes in __main__.py and utils.main and other.

Reinsert --no-browser option.

Move some code to utils.main.

Some other small style changes.

Fix merge conflict misstakes.

Change settings behavior. Add tests.

Fix rebase problems.
Changed begin speach behavior. Fix merge conflicts. Add tests.
Merge pull request #903 from normanjaeckel/CleanUpMain

Clean up main and move the code to __main__.py
Merge pull request #920 from normanjaeckel/CountdownAndAgenda

Countdown and agenda
Fix url_name_args problems in user and group views. Add tests.
Merge pull request #929 from normanjaeckel/UrlNameArgs

Fix url_name_args problems in user and group views. Add tests.
Send js to the projector

* fixed scroll and scale of the projector
Merge pull request #916 from ostcar/projector

Send js to the projector
Some bug fixing for 1.5b1

- Fixed #921 (Check THANKS URL for jQuery UI Nested Sortable)
- Fixed #919 (Permission problem in agenda)
- Fixed #918 (Search does not work for guest users)
- Fixed search-bar position.
- Updated EN po files.
Merge pull request #928 from emanuelschuetze/1.5-fixes

Fixes for 1.5b1
Fix missing url_name_args = [] lines in different views.

Fix custom slide create and update view.
Fix motion category create and update view.
Melt INSTALL.txt, THANKS and README.txt to new README.rst. Change metadate for portable version.
Merge pull request #924 from normanjaeckel/NewReadme

Melt INSTALL.txt, THANKS and README.txt to new README.rst
Merge pull request #935 from normanjaeckel/UrlNameArgs

Fix missing url_name_args = [] lines in different views.
added possibility to show pdfs on the projector