Perform tag whitelist check on data ingest too

This is because people may submit with an old client that doesn't
whitelist
Added support for client-side Less compilation.
Add emtpy id checking for artist and release
Merge pull request #23 from metabrainz/whitelist-import

Perform tag whitelist check on data ingest too
Merge branch 'whitelist-import'
Merge branch 'master' of github.com:metabrainz/acousticbrainz-server
Use the return value from clean_metadata
Added page titles.
Show metadata for the last 5 submitted tracks
Merge pull request #29 from tsukanov/titles

Page titles
Escape unicode chars
Fixed utf-8 encoding issue
Committing my speed improvements to the cleanup script that we shouldn't need anylonger
Ignore the download dir
Removed unused styling.
Merge pull request #30 from tsukanov/style

Removed unused styling
Only show " / $tracktotal" if $tracktotal is given.
Only show tracknumber row, if tracknumber tag is present.
Check for mb_artistid instead of _albumid for artist id.
[summary] Add links to the JSON data.