Add get_root_feeds_ng (one request for feeds, tags, etc.)
Add vote in get_root_feeds_ng (with a fucking +1)
Handle Lwt.fail with Lwt.fold_left_s
factorize code in new module
Add better factorization with sql table for Db_all (access to feed table and user table without copy/paste)
Use only Db_table in Db_* now (factorization)
Merge branch 'master' into optimization

Conflicts:
	src/base/db/db_user.ml
Change name of this module (Db_all to Db_feed_ng)
Remove empty line
Add TODO on get_tree_feed (sql request recursion is bad)
Add new object for next generation of feed
Accessor to database in Feeds module
First implementation (without handle of fav) of sql request with next generation of feed
Merge branch 'optimization' of github.com:Cumulus/Cumulus into optimization
Add different accessor to data (next generation)
Add feeds_of_db_ng
Add to_html_ng in Feeds (begin of success)
Use (finally) Feeds.to_html_ng (and all of dependance !)
Remove all non-ng functions and remove the _ng suffix
Remove duplicate tag