Improve docs for EC2_run_image and Image_run

- Fill in missing parameter description
- Include new instance types
Merge pull request #1487 from arturhoo/ec2-doc-fix

Improve docs for EC2_run_image and Image_run
Fix build break in cloudwatch test
Bump copyright to 2013 for cloudwatch unittest
Added config-based region support to DynamoDBv2.