Switch to biryani and prepare for pypi release

Includes:

- switch namespace from `biryani1` to `biryani`
- add extra_requires (pymongo, pydns, etc.)
- renamed Transifex project (this needs to be done on Transifex too)
- add entries in Makefile to manage package publication
- add entry in Makefile to run tests

Package has been already published on *testpypi* for testing but **not** on pypi.