Preliminary addition of stock/security quotes

Saw this was requested a few times in the forum and wanted to try my hand at adding an instant answer to DDG!

**What does your instant answer do?**
Looks up basic stock/security quote info from Yahoo finance and provides that data in an instant answer

**What problem does your instant answer solve (Why is it better than organic links)?**
Providing up-to-date stock quotes

**What is the data source for your instant answer? (Provide a link if possible)**
http://developer.yahoo.com/yql/console/

It would be wise of us to apply for API keys if this Spice is going to go live, but I wanted to get feedback first (just using the open API for now)

**Why did you choose this data source?**
Yahoo Finance is the go-to source of security price info used in the finance industry (aside from Bloomberg). In a web browser, finance professionals always seem to choose Yahoo Finance. Also, Yahoo Console is free/easily accessible.

**Are there any other alternative (better) data sources?**
In the forum, Kevin_WSL found a number of alternatives.

http://blog.programmableweb.com/2013/05/22/96-stocks-apis-bloomberg-nasdaq-and-etrade/

**What are some example queries that trigger this instant answer?**
*finance yhoo
*stock ibm
*stock price goog
*share aapl
*share price shy
*px rrr
*stock quote cat

A little awkward because quote trigger is already taken.

**Which communities will this instant answer be especially useful for? (gamers, book lovers, etc)**
finance professionals, investors, everyone

**Is this instant answer connected to a DuckDuckHack [instant answer idea](https://duck.co/ideas)?**

*https://duck.co/ideas/idea/299/real-time-stock-quotes
*https://duck.co/ideas/idea/31/displaying-the-current-stocket-exchange-rate-of-a
*https://duck.co/ideas/idea/838/real-time-stock-quotes-and-market-info

**Which existing instant answers will this one supersede/overlap with?**
Wolfram Alpha's auto stock quote info.

**Are you having any problems? Do you need our help with anything?**
Haven't yet worked out the front end. Would love suggestions and feedback. Right now it is just a listing of some high level data returned from the API.

![stockquotecat](https://f.cloud.github.com/assets/3512705/1894849/c0bcde42-7b01-11e3-84e1-4dd37ccc9976.png)
![stockquotemsft](https://f.cloud.github.com/assets/3512705/1894853/f36e413c-7b01-11e3-85f0-dcb5ce1f6b49.png)


##Checklist
Please place a ✔ where appropriate.

```
[✔] Added metadata and attribution information
[] Wrote test file and added to t/ directory
[] Verified that instant answer adheres to design guidelines(https://github.com/duckduckgo/duckduckgo-documentation/blob/master/duckduckhack/styleguides/design_styleguide.md)
[] Tested cross-browsear compatability

    Please let us know which browsers/devices you've tested on:
    - Windows 8
        [] Google Chrome   
        [] Firefox         
        [] Opera           
        [] IE 10           

    - Windows 7
        [] Google Chrome   
        [] Firefox         
        [] Opera           
        [] IE 8            
        [] IE 9            
        [] IE 10           

    - Windows XP
        [] IE 7            
        [] IE 8            

    - Mac OSX
        [] Google Chrome   
        [] Firefox         
        [] Opera           
        [] Safari          

    - iOS (iPhone)
        [] Safari Mobile   
        [] Google Chrome   
        [] Opera           

    - iOS (iPad)
        [] Safari Mobile   
        [] Google Chrome   
        [] Opera            

    - Android
        [] Firefox         
        [] Native Browser  
        [] Google Chrome   
        [] Opera
```