Add user api to pull json data for individual users

This commit adds two new urls:

```'/user'
'/api/user'```

<code>'/user'</code> is a simple form to fill to get information on the individual user.

<code>'/api/user'</code> Accepts both POST and GET requests. For POST requests, it expects a user in <code>req.body.irc_nick</code> and outputs all JSON for that user. 
For GET requests, it simply outputs a JSON list of all users in the config. NOTE: This list of users is not inclusive of all users who have filled out the form; It is only a list of all members who are EXPLICITLY listed in the configuration.