Removed the 'aws-sdk-v1.rb' script from the `aws-sdk` gem.

This file is only being made available via the `aws-sdk-v1` gem
to ensure the proper gem is loaded.
The aws-sdk.gemspec now simply requires the aws-sdk-v1 gem.
Added `#type` and `#encypted` attributes to `AWS::EC2::Volume`.

Fixes #607