Various cleanups to Ubuntu installation instructions:

* Avoid editing /etc/apt/sources.list add nginx repo, instead create
  /etc/apt/sources.list.d/nginx.list

* Avoid editing /etc/nginx/nginx.conf, instead put server_name_hash_buckets
  setting into discourse.conf

* Proper-case Discourse when it is referring to the product name, so that all
  the lowercase references are to the user created during the installation
Address @Supermathie's concerns in PR1430
internationalize Discourse.Formatter.tinyDateYear
Allow groups to be used as aliases for user mention

when configured by the admin a group can be found through the @mentions
feature in both the compose/reply and the private message user-selectors
and once selected the mention will be replaced by the list of users in
the group
move alias levels into enums
internationalize Discourse.Formatter.tinyDateYear
   missed client.??_??.yml
Fixing padding for misaligned small logo URL
Updated French translation
minor copyedit on deleting user
increase delete user max age from 14->60
Update favcount.js to v1.4.0
only update title if it changes
Merge pull request #1803 from chrishunt/update-favcount

Update favcount.js to v1.4.0
incorrect warning on site setting
use_ssl is just confusing, it means use_https , fix name of setting
Merge pull request #1802 from voisintotoro/trad20140108

Updated French translation
BUGFIX: attempt to forward on the protocol set by haproxy
BUGFIX: mobile ui was being cached for anon views
BUGFIX: fix broken spec
bench improvements