rroonga version 1.2.0 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:

### Improvements

* Supported groonga 1.2.0.
* Added Groonga::Accessor#local_name.
* Added Groonga::IndexColumn#with_section?.
* Added Groonga::IndexColumn#with_weight?.
* Added Groonga::IndexColumn#with_position?.
* Groonga::Schema.dump supported groonga command format dump.
* Added grndump command.
* Groonga::Database#each supports order customize.
* Added Groonga::Context#match_escalation_threshold.
* Added Groonga::Context#match_escalation_threshold=.
* Improved error message.
* Supported Rubyish name like :short_text instead of the
official type name like "ShortText" in Groonga::Schema.