Fix import ordering
Fix proxy handling

The requests library has code that handles HTTP_PROXY and HTTPS_PROXY
environment variables, but those are only applied in code paths that we
don't use.  Instead, we explicitly get proxy configuration from urllib
and pass it to requests.

Downstream report:  https://eucalyptus.atlassian.net/browse/TOOLS-447
AWSQueryRequest:  serialize booleans as lowercase

Downstream report:  https://eucalyptus.atlassian.net/browse/TOOLS-490
Version bump (0.1.1)