~samwhited/xmpp

ref: a42ef11e9469b0b65746f979e1bdf5155d1c13dd xmpp/ping d---------
all: update copyright message

[ci skip]
all: fix tests
all: update WrapIQ to support all IQ attrs

This also fixes bind
all: rewrap copyright comments/use xml.TokenReader
ping: rename PingIQ to IQ
ping: implement XEP-0199: XMPP Ping