Support single redis DB.
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
Locate the Puma config file.
Update puma.rb
Correct few spelling in the comments
Added some missing spanish translations
Add Global Keyboard Shortcuts

Not all of these have been fully implemented yet.

**Jump To**
* `g` then `h` - Home (Latest)
* `g` then `l` - Latest
* `g` then `n` - New
* `g` then `u` - Unread
* `g` then `f` - Favorited
* `g` then `c` - Categories List

**Navigation**
* `u` - Back to topic list
* `k` / `j` - Newer/Older conversation or post
* `o` or `Enter` - Open selected conversation
* <code>`</code> - Go to next section
* `~` - Go to previous section

**Application**
* `c` - Create a new topic
* `n` - Open notifications menu
* `/` - Search
* `?` - Open keyboard shortcut help

**Actions**
* `f` - Favorite topic
* `s` - Share topic
* `<Shift>` + `s` - Share selected post
* `r` - Reply to topic
* `<Shift>` + `r` - Reply to selected post
* `l` - Like selected post
* `!` - Flag selected post
* `b` - Bookmark selected post
* `e` - Edit selected post
* `d` - Delete selected post
* `m` then `m` - Mark topic as muted
* `m` then `r` - Mark topic as regular
* `m` then `t` - Mark topic as tracking
* `m` then `w` - Mark topic as watching
Add a few extra ProxyPass calls

These avoid a lot of 404 errors, and things like the style editor not working because the browser can't reach scripts, etc.
similar_topics french locale was rough
Fix missing pin icon.

pushpin was renamed to thumb-tack in Font Awesome 4.0.
Merge pull request #1769 from vikhyat/fix-thumb-tack-icon

Fix missing pin icon.
extend bench somewhat
BUG: drafts broken for new topics
oops missing quote
Block passwords that are in the top 5000 most common passwords. Site setting block_common_passwords can disable this feature.
Fix password_validator_spec
FIX: only show edit reason when the user action is an EDIT
first stab at calculating the score of a topic for the top tab
let's try another formula for the top tab