DynamoDB Update and Insert item bug fixes

Implemented a few bug fixes that prevented the Update function to work correctly

DynamoDB update and add records

This release contains the update and add operations for the DynamoDB element.

DynamoDB bugfix

Implemented a bug fix that prevented multiple conditions in queries

DynamoDB element

This release contains the aws-dynamodb element. Using this it is possible to retrieve records from an AWS DynamoDB database right from your Polymer application.

Initial release

This release contains the aws-app and aws-lambda elements. Using these it is possible to invoke an AWS Lambda function right from your Polymer application.