Support of "New" XMPP RFCs

Please add support of last RFCs.

About XMPP RFCs:
- https://tools.ietf.org/html/rfc3920 -> https://tools.ietf.org/html/rfc6120 to https://tools.ietf.org/html/rfc7590
- https://tools.ietf.org/html/rfc3921 -> https://tools.ietf.org/html/rfc6121
- https://tools.ietf.org/html/rfc3922
- https://tools.ietf.org/html/rfc3923
- https://tools.ietf.org/html/rfc4622 -> https://tools.ietf.org/html/rfc5122
- https://tools.ietf.org/html/rfc6122 -> https://tools.ietf.org/html/rfc7622
- https://tools.ietf.org/html/rfc7711
- https://tools.ietf.org/html/rfc7712
- https://tools.ietf.org/html/rfc7395

Difference noted in RFCs:
- https://tools.ietf.org/html/rfc6120#appendix-D
- https://tools.ietf.org/html/rfc6121#appendix-E
- https://tools.ietf.org/html/rfc6122#appendix-C
- https://tools.ietf.org/html/rfc7622#appendix-A

Note:
- http://jabber.996255.n3.nabble.com/Changes-missing-from-RFC-6120-s-Differences-from-RFC-3920-td30486.html

RFC3920 -> RFC6120
- https://tools.ietf.org/tools/rfcdiff/rfcdiff.pyht?url1=https://www.ietf.org/rfc/rfc3920.txt&url2=https://www.ietf.org/rfc/rfc6120.txt

RFC3921 -> RFC6121
- https://tools.ietf.org/tools/rfcdiff/rfcdiff.pyht?url1=https://www.ietf.org/rfc/rfc3921.txt&url2=https://www.ietf.org/rfc/rfc6121.txt

Draft but Very Important:
- https://tools.ietf.org/html/draft-cridland-xmpp-session-01