Transcoding

Closes #60

See merge request funkwhale/funkwhale!47

Now reset player colors when track has no cover

See merge request funkwhale/funkwhale!46

0.4 (2018-02-18)
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- Front: ambiant colors in player based on current track cover (#59)
- Front: simplified front dev setup thanks to webpack proxy (#59)
- Front: added some unittests for the store (#55)
- Front: fixed broken login redirection when 401
- Front: Removed autoplay on page reload
- API: Added a /instance/settings endpoint
- Front: load /instance/settings on page load
- Added settings to report JS and Python error to a Sentry instance
  This is disabled by default, but feel free to enable it if you want
  to help us by sending your error reports :) (#8)

Resolve "Ambiant colors from artist / album images"

Closes #59

See merge request funkwhale/funkwhale!45