Release 1.1

And here's the Chinese New Year release of pycangjie!

The following was done in this release:
* Add docs to the tarball (Mathieu)
* Add a link to the release tarballs in the README (Mathieu)
* Add install instructions for a few distributions (Mathieu)
* Improve « make clean » (Anthony)
* Fix the URL to the documentation in the README (Linquize)