Bumped to v2.1.0!
Errors: include httplib2 status / reason as extra logging data

This allows log monitors like Sentry to see the reason code which is
normally inaccessible as a property on the httplib2.Response
Handle httplib2 variation in response reason location

Unlike the status, httplib2.Response will not include the reason
code in its dictionary interface. This change will look for a reason
property first and then fall back to the dictionary as before