Release 1.0

Finally, here it is. :)

Note that the so-version is 2.0.0. This is because Wan Leung's
libcangjie was already using the 1.0.0 so-version, so we should bump to
indicate that we are not compatible.
Merge pull request #43 from Cangjians/1.0

Yup, that's a 1.0
Fix typo in data/README.table.rst
Merge pull request #44 from linquize/typo

Fix typo in data/README.table.rst
docs: Add docs to the tarball
README: Add a link to the release tarballs
Merge pull request #45 from Cangjians/docs

Docs
Correct typo of README file
Merge pull request #47 from anthonywong/master

Correct typo of README file
bench: Actually benchmark something

We were looping on the letters from a to z, but always getting the
characters corresponding to an empty string.
bench: Improve the output
bench: Test some more
bench: Add the missing copyright header

Fixes #48
Merge pull request #49 from Cangjians/bench

Various changes to the benchmark tool
dbbuilder: Remove dead decrement

This was caught by clang's scan-build.
cangjie: Free memory on errors

These were caught by clang's scan-build.
cangjie: Free memory earlier

This avoids a potential memory leak on an error condition further down
the road.

This was caught by clang's scan-build.
cangjie: Drop a dead assignment

This was caught by clang's scan-build.
Merge pull request #52 from Cangjians/scan-build

Some code correctness improvements
cangjie: Factor code in cangjie_get_filter_query

The OR logic has been extracted in a separate function.