Style addthis buttons
Closes #9

Squashed commit of the following:

commit 9e7813819c1ea887c27a878ccb1f961c4e56334d
Author: Abhishek Srivastava <abhishek77in@gmail.com>
Date:   Fri Dec 12 17:20:19 2014 +0530

    Style addthis buttons

commit 27be6f400919443411286f61f5cc16f2b0160f0e
Author: Abhishek Srivastava <abhishek77in@gmail.com>
Date:   Thu Dec 11 23:30:53 2014 +0530

    Add addthis button

commit aba1be713a84b7fa2d0df2250a8f37215a078337
Author: Abhishek Srivastava <abhishek77in@gmail.com>
Date:   Thu Dec 11 23:18:48 2014 +0530

    Include addthis script