Google reCAPTCHA library

Hi, I've been working on a project lately where I needed to use a reCAPTCHA.
I searched for a library to use the Google reCAPTCHA but didn't get what I was looking for,
So I decided to code my own, It's not something big but it does the job.
I added config options so you can use it as you want.

Link to GitHub:
CodeIgniter reCAPTCHA

Any changes are welcome!

I've pushed you some changes, please take a look into it once you get chance