Create a project to contain non production ready implementations of specifications

There are a couple of patches as well as proposals on the forums related to support for XEP's that are not considered production ready for various reasons.

• Have not reached Draft status

• Have become obsolete

• Have been designated to be replaced

A place is needed to keep code to support these implementations, which would also make it clear that they are to be used "at your own risk", as they are prone to things like frequent change and potentially have little support.