Add new Instant Answer: Coderwall

**What does your Instant Answer do?**
Display information about a coderwall.com user

**What problem does your Instant Answer solve (Why is it better than organic links)?**
It helps to ensure a specific user is found (by displaying location) and provides a direct link to the user's profile

**What is the data source for your Instant Answer? (Provide a link if possible)**
[Coderwall API](https://coderwall.com/api)

**Why did you choose this data source?**
It is the only one that i know of.

**Are there any other alternative (better) data sources?**
No

**What are some example queries that trigger this Instant Answer?**
`coderwall jagtalon`, `motersen coderwall`

**Which communities will this Instant Answer be especially useful for? (gamers, book lovers, etc)**
programmers

**Is this Instant Answer connected to a DuckDuckHack [Instant Answer idea](https://duck.co/ideas)?**
[Yes](https://duck.co/ideas/idea/760/coderwall-instant-answer)

**Which existing Instant Answers will this one supersede/overlap with?**
None that i know of.

**Are you having any problems? Do you need our help with anything?**
I initially wanted to limit the display to three badges by setting `to` in `{{#each}}` to a variable determined in `normalize`. But I could not get it working.

**What are the terms of use for the API? Will DuckDuckGo need specific authorization (e.g. an API key)? Are there any costs associated with API usage?**
No API key needed, no terms of use known. Therefore: no costs.

**Where did you hear about DuckDuckHack? (For first time contributors)**
DuckDuckGo

**What does the Instant Answer look like? (Provide a screenshot for new or updated Instant Answers)**
[coderwall jagtalon](http://i.imgur.com/7Llh3lL.png)

## Checklist
Please place an 'X' where appropriate.

```
[X] Added metadata and attribution information
[X] Wrote test file and added to t/ directory
[] Verified that instant answer adheres to design guidelines (https://duck.co/duckduckhack/design_styleguide)
[X] Verified that instant answer adheres to code styleguide (https://duck.co/duckduckhack/code_styleguide)
[] Tested cross-browser compatibility
@motersen Can we make this a little more extensible? I think we could make a hash of service names to their urls, with some placeholder (like `{{}}`) to mark where the username goes. Then the item.accounts object could be iterated (using `$.each()`) and populated with urls by calling `.replace('{{}}', name)`.

This is assuming they will add the rest of the account info to the coderwall API -- we might want to reach out to them.