Veraticus/Dynamoid — pull request #23 by ananthakumaran (2012-04-02 16:50:44+00:00)
Title: cache table so that we don't make describe_table request every time

`@@connection.tables[table_name]` [ln](https://github.com/amazonwebservices/aws-sdk-for-ruby/blob/master/lib/aws/dynamo_db/table_collection.rb#L110) creates a new table which in turn issues a describeTable request to the db. we can avoid the additional describeTable request by caching the table.