Calculator Goodie update for Logarithm



What does your instant answer do?
Modified the Calculator.pm goodie to calculate log(x) to the default base 10 from e

What problem does your instant answer solve (Why is it better than organic links)?
https://duck.co/ideas/idea/1032/change-logx-to-calculate-the-base10-logarithm

What is the data source for your instant answer? (Provide a link if possible)
https://duck.co/ideas/idea/1032/change-logx-to-calculate-the-base10-logarithm

Why did you choose this data source?
Reliable Resource

Are there any other alternative (better) data sources?
No

What are some example queries that trigger this instant answer?
log(x) will return log10(x) value
log(29)
log(30)

Which communities will this instant answer be especially useful for? (gamers, book lovers, etc)
General,Students,Maths

Is this instant answer connected to a DuckDuckHack instant answer idea?
https://duck.co/ideas/idea/1032/change-logx-to-calculate-the-base10-logarithm

Which existing instant answers will this one supercede/overlap with?
No Existing Answers

Are you having any problems? Do you need our help with anything?
As of Now,No Thanks!!!
Cheers!!!

**Note: Please attach a screenshot for new instant answer pull requests, and for pull requests which modify the look/design of existing instant answers.

##Checklist
Please place an 'X' where appropriate.

[Dint Modify as it is a very small change] Added metadata and attribution information
[Kept the Existing Test Files.No Modification.No New functionality added] 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)
[I have only Linux Installed in my System.I tested it in Firefox and Konqueror.Regrets] Tested cross-browser 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