Minor fixes

Moved dependency injection slides before the message mutators
Added note to how to instantiate a message
Minor code cleanup on Send a message
Removed transport from Consistency slide
Corrected code for Headers. Added remarks for OutgoingHeaders
Message processing pipeline also shows generic message handling for
conventions
Corrected Set Pipeline Order
Added remarks to Impersonation which actually does not "real"
impersonation
Added remarks to Message Auditing