Fixes #93, Fixes #90, Fixes #88, Fixes #89

Issue #89 was fixed by removing the startswith-Filter. In the new Interface
that would not show up.
Update forms.py

Fixed Internal Server Error when using categories 'editor' or 'keyword' in extended search
Imported 1.5_template_rework bibtex & import adjustments
Merge branch 'stable'

Conflicts:
	app/documents/forms.py
	app/documents/urls.py
	settings/dev.py
	templates/doc_list.html
	templates/index.html
Commented out the footer as it does not contain valuable information anyway