add migration for IPv6 adresses (migration for commit f4456393)
LAMBDA-151: migraten: adding mediafile permissions to users with
mediaitem permissions
LAMBDA-144: get filesize for files without size
refactoring: make functions "internal"
LAMBDA-152: exclude duration
LAMBDA-113: use localized date as default
LAMBDA-154: use title again for download-filename
LAMBDA-150: itunes:image with href attribute
refactoring: rename filter secondstohms to seconds_to_hms
LAMBDA-156: create SubmittalMiddleware
LAMBDA-156: create SettingsMiddleware
LAMBDA-156: create PagesMiddleware
LAMBDA-156: refactoring views with TemplateResponse
FIX: RuntimeWarning: DateTimeField received a naive datetime while time
zone support is active.
LAMBDA-159: do not use DOMAIN for STATIC_URL by default.

It is not safe to use something like "//localhost" for DOMAIN because of
opengraph and rss-feeds.
LAMBDA-160: display livestreams only if enabled
LAMBDA-153: make license dropdown bigger :)
remove admin form for MediaFile (you can edit MediaFiles in MediaItems)
Merge branch 'master' into theradiocc