Removing symlink README -> README.md

py2dsc does not like it to find a symlink as README. Another solution
could be to symlink README.md -> README. But I think nobody will miss
it.
Setting +x to setup.py

At least the debhelpers need the x bit on the setup.py file to build a
debian package which is not empty.
Merge pull request #36 from craneworks/build-fix

Build fix