List user's keys

[rochacon]

Hi. I couldn't sleep so I thought I should be doing something useful. 😄

This branch tries to add a new API handler to list a user keys (as requested in #9). Here are some things to consider:

• Currently the keys listed are those retrieved from the DB, is this good enough? Any need to check the authorized_keys file for listing?
• The URL that I chose was /user/:username/keys, is that a good one?
• Still needs to be properly documented

Here is an example of a response:

curl -i 127.0.0.1:8000/user/rochacon/keys
HTTP/1.1 200 OK
Date: Thu, 18 Apr 2013 06:58:39 GMT
Transfer-Encoding: chunked
Content-Type: text/plain; charset=utf-8

{"gandalf":"ssh-rsa gandalf is@awesome","golang":"ssh-rsa golang rocks@globocom"}

[flavianmissi]

Hi,

Everything seems great, thank you for the contribution!