assets: Added assets package and Environment class
assets: Added generate_assets.py script

This will manually generate all needed assets.
middleware: Added AssetsMiddleware fallback for development machines
assets: Added basic css-all bundle
assets: Enabled auto_build mode for development machines
assets: Added js-flight bundle
assets: Added flags.css to css-all bundle
assets: Added js/css-openlayers bundles
assets: Added js-tracking bundle
Removed pointless /static/jquery -> /js/jQuery redirection
assets: Added js-all bundle
assets: Moved datepicker.css to css-all bundle
assets: Added js-datatables bundle

Reduced the JS filesize from 365 KB to 112 KB