Fix name of LICENSE file in MANIFEST.in

This avoids a warning during build (and during pip install).

Also, fix license parameter in setup.py. This param should
be the name of the license, not the file containing the
license. Since this package is dual licensed I copied the
syntax used in setuptools itself which is "XXX or YYY".
Update README install instructions
release on tag
Merge pull request #49 from mahmoudimus/release-on-tag

Release to pypi on tag
Fix PyPi release hook with proper branch
Another fix for Travis CI to deploy on PyPi
Update version