Added support to serverless@v1-rc.1

Adding table creation and seed templates support. Also allows to run the templates to create the database tables as well as to update the tables with defined seeds data.

Support to add configuration options for plugin through s-project.json so that its possible to run simply
sls dynamodb start

Implement the basic functionality for dynamodb local
-Automatically download and start dynamodb local with progress
-Support to remove current version and intall with update
-Allow all the parameters supported by dynamodb local