- add flatpages app to gnuviechadmin.settings.base.DJANGO_APPS
- add imprint handling to gnuviechadmin.context_processors.navigation, remove
unused about page handling
- add URL 'imprint' to gnuviechadmin.urls
- replace link 'about' in template base.html with 'imprint'
- add templates for flatpages
- add german translation for imprint and contact navigation links
- add new links dropdown to top navigation in template base.html
- add new settings GVA_LINK_WEBMAIL, GVA_LINK_PHPMYADMIN and
GVA_LINK_PHPPGADMIN to gnuviechadmin.settings.base
- implement gnuviechadmin.context_processors.navigation to add links to
request context of non-AJAX requests
- add generated documentation for gnuviechadmin.context_processors
- add changelog entry