Travis, Tox, setup.py, MANIFEST.in, moved locales

Moved locales to the package directory.
Added:
* setup.py for installing ganeti_webmgr as a Python Package
* MANIFEST.in for obvious reasons
* tox.ini to configure tox (multiple Python versions testing)
* .travis.yml to configure continuous integration

NEXT:
* making tests work with `setup.py test`