Store Ruboty's memory in LevelDB.

Add this line to your Ruboty's Gemfile:

gem "ruboty-leveldb"

LEVELDB_PATH          - LevelDB path (default: ruboty.ldb)
LEVELDB_SAVE_INTERVAL - Interval sec to save data to LevelDB (default: 5)

1. Fork it ( https://github.com/[my-github-username]/ruboty-leveldb/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request