Add new Mailto goodie

What does your instant answer do?
Provides a way to quickly initiate email composer.

What problem does your instant answer solve (Why is it better than organic links)?
Using DDG as an internet cmdline users want a way to initiate emails with fewest clicks possible.

What is the data source for your instant answer? (Provide a link if possible)
No external data.

What are some example queries that trigger this instant answer?
"mail info@company.com"

Which communities will this instant answer be especially useful for? (gamers, book lovers, etc)
Power users.

Is this instant answer connected to a DuckDuckHack instant answer idea?
No.

Which existing instant answers will this one supercede/overlap with?
None.

Are you having any problems? Do you need our help with anything?
Not realy. Although I would like to have a way to easily provide l10n. I haven't yet figured a way.

![_001](https://cloud.githubusercontent.com/assets/47310/3458986/71134a74-0207-11e4-89a2-ad843b67522b.png)

Checklist

Please place an 'X' where appropriate.

[X] Added metadata and attribution information
[X] Wrote test file and added to t/ directory
[X] Verified that instant answer adheres to design guidelines(https://github.com/duckduckgo/duckduckgo-documentation/blob/master/duckduckhack/styleguides/design_styleguide.md)
[X] Tested cross-browser compatibility

    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