Fix #696
Fixed typos. Changed doc style of html and latex output.

- HTML: Changed to twittter bootstrap theme.
- PDF: Improved latex pdf.
- Added doc authors to Impressum section.
- Added required sphinx packages to requirements.txt
Some corrections of the German documentation
Merge pull request #697 from normanjaeckel/Fix_Post_DB_Setup_Signal

Fix #696
Merge pull request #693 from anjahitziger/Handbuch

German documentation
Change order of agenda fields
Motion: Change default numbering method
Update requirements
Update CHANGELOG
Merge pull request #707 from normanjaeckel/CHANGELOG

Update CHANGELOG
Merge pull request #706 from normanjaeckel/UpdateRequirements

Update requirements
Merge pull request #704 from normanjaeckel/ChangeFieldOrder

Change order of agenda fields
Merge pull request #705 from normanjaeckel/ChangeMotionDefaultNumbering

Motion: Change default numbering method
Template improvements.

Improved agenda and participants overview.
Fixed merge error.
Fixed #703: Mcrophon icons for list of speakers
Fixed #702: list of speakers projetor/overlay style.
Fixed #701: Check bootstrap tooltips on all buttons.
Fixed #652: Button for ageda item with related sid.