rroonga version 1.0.0 has been released!

rroonga is a extension library to use groonga's DB-API
layer. rroonga provides Rubyish readable and writable
API. You can use groonga's first and highly functional
features from Ruby.

Changes:

* Supported groonga 1.0.0.
* Added Groonga::CASError.
* Added :order_by option to Groonga::Table#open_cursor.
* Added Groonga::PatriciaTrie#open_prefix_cursor that creates a cursor
to retrieve each records by prefix search.
* Added Groonga::PatriciaTrie#open_rk_cursor that creats a cursor to
retrieve katakana keys from roman letters and/or hiragana.
* Added Groonga::PatriciaTrie#open_near_cursor that creates a cursor to
retrieve records order by distance from key.
* Supported _key as index source.