Added basic album page.

Bug: CB-3
Added link to album on review page.
Fixed imports.
Added creation date and rating into table with reviews.
Fixed indentation.
Separated long line.
Added proper error handling into album_details getter in MusicBrainzClient.
Added links for albums on the homepage.
Modified new album page template to be compatible with updated base template.
Merge branch 'cb-20' into stage1

Conflicts:
	client/critiquebrainz/templates/index.html
	client/critiquebrainz/templates/review/entity.html