Fix error in MANIFEST.in
Ignore *.egg-info files generated by setuptools
Switch from distutils to setuptools
docs: setuptools always regenerates MANIFEST
Let setuptools generate executables
docs: Remove 'platforms' from extension's setup.py example
docs: If using pip Pykka will be installed automatically
docs: Fix typo
Merge pull request #373 from jodal/feature/use-setuptools

Switch from distutils to setuptools