Update MANIFEST.in

to make it possible to create rpm packages again using setup.py bdist_rpm
Merge pull request #95 from FrankCRoth/patch-1

Update MANIFEST.in
Update README.md - supported python versions

Python language support documentation: pyVmomi 5.5.0_2014.1 and above supports Python 2.6, 2.7, 3.3 and 3.4