Release Name: 0.0.7

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


Changes:
* Supported groonga 0.1.4
* Added API
  * Groonga::PatriciaTrie#scan
  * Groonga::PatriciaTrie#tag_keys
  * Groonga::Expression#snippet
  * Groonga::Object#append
  * Groonga::Object#prepend