activegroonga version 1.0.2 has been released!

groonga provides both of full text search and column store
features. ActiveGroonga + groonga can be used as an
alternative of ActiveRecord + RDB.

Changes:

### Improvments

* generator: Supported table type customize.
* Added ActiveGroonga::Base.exists?.
* Added ActiveGroonga::Base.all.

### Changes

* Changed to use record key instead of record ID for record
identifier for hash table and patricia trie.