Change configuration file format

Before {mod_*_odbc, []}.
After {mod_*, [{backend, odbc}]}.
Excplicitly *resend* the message
Merge branch 'arc-unification-test' of https://github.com/arcusfelis/ejabberd_tests into arcusfelis-arc-unification-test

Conflicts:
	test.config
new testcases for xmpp over websockets
check xmlns in messsage
fix node name (ejabber@... -> mongooseim@...)