Migrate to Bootstrap 3.1.1 and introduce Font Awesome

Almost a week for just one commit and it is my biggest commit ever! lol
I didn't upgrade only Bootstrap in this pull request but I also add [Font Awesome](http://fortawesome.github.io/Font-Awesome/) to our app since I found that some icons we have used is removed in the new version.  I think it's cool stuff hope you like it as me. 

I have to rewrite layout in some page e.g. wrapper because the components we're using is deprecated but I tried to keep our existing style as much as possible.

I have checked every page as far as I have access to both desktop and mobile and they seem to be alright (fingers crossed ;-) )

Please let me know if I have broken any thing, I will fix it as soon as possible. Thanks for your patient! :)