[wsrp-interfaces] [wsrp-wsia]: Updated alternative API

The following is an updated version (attached) of the counter-proposal
to draft 0.1.2 I sent last week.  The main changes are the session as
well as the entity references are created/sent by the consumer.  There
is also a new reference for an entity session -- the session
conversation with a specific entity.  Finally, I have simplified the
method signature defining a single ConsumerCtx parameter to hold all the
(potential) references.  There are still alot of details to put in here
so we have a consistent understanding but I though you would like an
early view.  While waiting for these details the key to looking at this
is to think in terms of the consumer vs. the producer.  This API doesn't
represent (many) abstractions as concrete objects in the producer.
Rather, most abstractions are seen as elements/scopes defined by the
consumer that are passed by reference to the producer.  The Producer is
thus freed to represent themselves internally anyway they want to --
merely needing to build a mechanism that maps from these references to
their implementation.
     -Mike-