Support AWS using Libcloud or botocore. Refs #303.

* Renamed the current AWS cloud module to `libcloud_aws`.
* Created `botocore_aws` cloud module.
* Moved specific `botocore` functions to the `botocore_aws`.
* Minor PEP-8 and formatting.
Fix `SyntaxWarning: import * only allowed at module level`.
new release
recommend botocore for issue #303
Remove `botocore` from the requirements file.
Merge pull request #341 from s0undt3ch/features/libcloud-and-botocore-aws

Support AWS using Libcloud or botocore. Refs #303.
Initial ec2 driver, replacing libcloud with direct API calls
Update README
Merge pull request #349 from techhat/develop

Update README
Replace list_nodes with a direct API version
Add list_nodes_full, refactor xml_to_dict
Refactor list_nodes_full, add start/stop
Troubleshooting create()
Remove get_instance
Finally got the create() function working
Update ec2 driver to say EC2, not AWS
Merge pull request #350 from techhat/ec2

Adding experimental EC2 driver
Fix `NameError` issues by bringing imported `libcloud_aws` functions to the `botocore_aws` namespace. Fixes #351