Add support for displaying Commons images in the sidebar for artists and labels (MBS-6755)
Whitespace fixes
Merge remote branch 'origin/master' into sidebar-images

Conflicts:
	lib/MusicBrainz/Server/Data/URL.pm
Separate shared MediaWiki code out into a new file
Use scheme-independent URLs for the images and a few other fixes
Remove accidentally committed commented out code
Update sidebar wording with Rob's suggestion
Merge remote-tracking branch 'nikki-bitbucket/sidebar-images' into beta

* nikki-bitbucket/sidebar-images:
  Update sidebar wording with Rob's suggestion
  Remove accidentally committed commented out code
  Use scheme-independent URLs for the images and a few other fixes
  Separate shared MediaWiki code out into a new file
  Whitespace fixes
  Add support for displaying Commons images in the sidebar for artists and labels (MBS-6755)