Make Rayo models plain Ruby objects

Export to XML / Import from XML if connecting to a real Rayo server by XMPP
[DOC] Changelog entry
Revert "[DOC] Changelog entry"

This reverts commit db5a23acf3c862b9d76c9aa36d0fce40cd5fbb24.
[DOC] Changelog entry
Merge branch 'feature/porm' into develop
Reconnect dead Asterisk streams
Added spec for reconnection
Changelog entry
Proxy for RubyAMI::Stream
Join/Unjoin on not owned calls
Fix merge