rfc2616 and aliases http11 to it
added rfc2141
added rfc2326 (RTSP)
added rfc2717 (registration procudure for URL scheme names)
use http refs and not https ones for RFCs
added rfc2718 (guidelines for new URL schemes)
added rfc3261 (SIP: Session Initiation Protocol)
added rfc3920 (Extensible Messaging and Presence Protocol (XMPP): Core)
fix typos
fix typos
fix typos (again)
fix typos (again)
Merge pull request #6 from ylafon/master

few RFC updates