Bangla (Indic Language) Keyboard Support added

I have just added support for language input in Bangla (an indic language). Thus, I have created a new group named "Indic" and added that to the settings index file too. There is a screenshot attached of the newly added keyboard layout.
![Untitled window_027](https://f.cloud.github.com/assets/932949/165262/d39c8f8c-792f-11e2-8c6e-a99c1667bae7.png)

I would be glad if this patch gets merged into Gaia. Cheers!