Release 1.1

Here's the Chinese New Year release!

Let me try to do a proper changelog this time:
* Fix typo in data/README.table.rst (linquize)
* Add docs to the tarball (Mathieu)
* Add a link to the release tarballs in the README (Mathieu)
* Correct typo of README file (Anthony)
* Improve the benchmark tool (Mathieu)
* Add a missing copyright header to the benchmark tool (Mathieu)
* Various code improvements (Mathieu, with help from clang's scan-build)
* Code refactoring of the filter handling (Dridi)
* Add install instructions for a few distributions (Mathieu)
* Document libcangjie_cli (Mathieu)