Initial commit of boto_sqs state and module

This state and module manage SQS queues via boto, rather than the
aws commands. Since it's using boto, it supports IAM instance profile
credentials natively. The module and state also support the ability
to accept key/keyid credentials as parameters, through pillars or
through minion configuration.

In addition, the state and module supports managing queue attributes.
In the state this is added as an argument. In the module it's a separate
function. The module also has support for fetching the attributes for a
queue.