Customizing internet data

[Prakash Murthy]

Hi, 

Following a question on Stack Overflow about customizing http://stackoverflow.com/questions/29365516/rails-faker-how-to-create-custom-method ) , I added the ability to customize internet data on a forked repo https://github.com/prakashmurthy/faker/commit/2d53b2abf08abc73a35544c674a233821db0e3b3

I wasn't sure if this is a good feature to add back to the gem as the use case (adding 'useful_data'  to internet data type) doesn't seem like a common one; so haven't sent a pull request yet. 

Let me know if this feature can be added (with or without changes.) 

Thanks,

Prakash