Merge pull request #17 from Cangjians/1.x

Release 1.1
install: Add NixOS instructions
Use /bin/sh
Merge pull request #19 from linquize/install-nixos

pycangjie is available on NixOS
Add install instructions in Arch
Merge pull request #20 from Cangjians/install

Add install instructions in Arch
ci: Build against the 1.x branch of libcangjie

libcangjie master broke its API, so we can't build the 1.x branch of
pycangjie against libcangjie master any more.

This is all perfectly expected though, but we need to tell Travis about
it.
Merge pull request #22 from Cangjians/tests

ci: Build against the 1.x branch of libcangjie
tests: Use libcangjie_cli arguments

Now we can, thanks to @yookoala
tests: Move inheritance a bit

There's no reason to make each of our test cases a mixin, making our
BaseTestCase inherit from unittest.TestCase simplifies writing new unit
tests.
tests: Test **all** filters on

Thanks to @yookoala's work, we can do that now, which makes for better
coverage of the libcangjie data.
tests: Check Cangjie version 5 too!
Merge pull request #23 from Cangjians/tests

Various unit test improvements
Remove obsolete notice

We do have release tarballs, now.

Fixes #21
Merge pull request #24 from Cangjians/install

Remove obsolete notice
Release 1.2
Merge pull request #25 from Cangjians/1.2

Release 1.2