Merge pull request #42 from JeanHany/origin/next

Origin/next
start.sh: fix starting in HTTP mode
Use request context to set scheme, host and port urls.
Allow to run several listeners at a time
Rewrite XMPP client with erim client
Merge remote-tracking branch 'upstream/next' into origin/next

Conflicts:
	src/listeners/occi_xmpp_client.erl