Dynamodb local support

[barrysteyn]

This component be able to be used with dynamodb local. This could be accomplished by implementing a method on the component: describeTable, that would output the cloudformation used to create the table. This could then be used as input to a script that would create the table within the local dynamodb.

Questions:

1. If one uses a yml file with many instances of this component, how could this be run for each instance.

[barrysteyn]

With changes in serverless/template#8, the question posed above becomes more possible.