Strip " from the key filename

This is a workaround for a bug in Vagrant, which was fixed by this PR:

https://github.com/ronnix/fabtools/pull/90

but some release versions of Vagrant still have it.
Merge pull request #5 from asmeurer/vagrant

You have to execute vagrant up first
Merge branch 'vagrant' of https://github.com/certik/sympy into vagrant
README: remove the ???
Install Python 3 and build Python 3 tarballs
Build the docs
Install zip
Copy the docs
Split the release function