Update d-r dependency

Fix encoding in test files for xgettext

Add RQLFilterBackend to whole API

Add themes

Change the current block title to only contain the title string

Change the current block title to only contain the title string and be a
placeholder, this block should be overrid in every template

Quickstart update

Update README.md

Fix issue #120 (replace outdated installation instructions with a link to the manual)

Fix API inconsistencies

Active when DATA_DIR/sentry.404 exists

Add sorting to rep list and dossier list

Add chamber links and refactor contact block a bit

Rework icons

Editing stylesheets is no longer needed, just drop a 'group-CHAMBER-ABBR.png'
file in static/images and it will be loaded.

Update dependencies

Add dossier documents