Add South Asia fonts

Follow up to #358
See the [Unicode Font Guide](http://www.unifont.org/fontguide/) for what I am considering South Asia.

* [x] Devanagari (India, Nepal)
* [x] Bengali (Bangladesh)
* [ ] Gujarati (India)
* [x] ~~Gurmukhi (India, Pakistan)~~ (Could only find LINESTRINGs, which aren't rendering due to bugs)
* [x] Kannada (India)
* [x] ~~Oriya (India)~~ (Not found in DB)
* [x] ~~Sinhala (Sri Lanka)~~ ([Too many uses](https://lists.openstreetmap.org/pipermail/talk-si/2014-March/000312.html) of it for Slovene right now to track down names)
* [x] Tamil (India, Sri Lanka, Singapore)
* [x] Tibetan (China)
* [x] ~~Urdu (Pakistan)~~ (Covered by DejaVu)

There are additional scripts in the region, but I believe them not likely present in name tags. If I'm missing one, I'd like to know.