Opendoor Labs Rets Versions Save

• Instantiate a RetsClient from the metadata, capability URLs, and session cookie saved from a previously logged in client

• Use post everywhere for http requests
• Use session and save the cookie
• Fix some data types, namely for lookup values, and assume lookup values are strings
• Throw exception if we see a nonzero rets-status: This was the original behavior, but certain code paths such as search can have an additional rets-status that should be used instead of the top level one. We added parsing for this new status

• Removes dependencies on beautifulsoup and lxml
• Implements user agent digest authentication
• RetsHttpClient infers the RETS server's base url from the full login url
• parse_multipart ignores parts with 20403 No Object Found errors

Initial release