Convert README to reST

Currently, PyPI supports only reST as markup format while GitHub can
live with both markdown or reST, so it's easier to use reST.

In setup.py we can now assume that README.rst exists since it is
included in the source distribution via MANIFEST.in.
Convert LICENSE to reST as well

Its simpler to have only one markup format present in the project.
Use unix line endings in setup.py and MANIFEST.in and mode 644 in setup.cfg

Nobody wants DOS line endings. Best compare with:

    git diff --ignore-space-at-eol
Merge pull request #19 from coldfix/reST

Use reST format for README and LICENSE