CF094 - JSON -> XML

A repose filter which converts a POSTed JSON payload to an XML payload
following the rules outlined in the JsonXmlFilter class.

This commit also removes the tenant-feed filter.  It has been
reimplemented in cloudfeeds-atomhopper.
no longer setting accept header on request
updating method name; integrating with XML -> JSON filter
Merge pull request #8 from usnavi/CF-94_json

CF-94 - JSON -> XML