Don't recompute current user (q:1324 -> 697)
Rank in pure SQL (q:697 -> 34)

Closes #51
refactor score_width
Fetch score of items in a single query (q:34 -> 4)

closes #53
Merge branch 'master' into queryperf

* master:
  Update mosileno/static/css/mosileno.css
  Separating topics_tools and tika + new requests
Admin panel basics
Admin : trigger tasks
Extract Feed.by_slug
Extract User.logged_in()
Merge branch 'admin' into queryperf

* admin:
  Extract User.logged_in()
  Extract Feed.by_slug
  Admin : trigger tasks
  Admin panel basics

Conflicts:
	mosileno/ranking.py