Create HTTP edge receptor

[zippy]

• parse HTTP_REQUEST parse protcol
• move current example code into base_defs
• figure out routing between translation layers
• add socket handling code to stream.c listener()
• add conversion of HTTP_REQUEST tree back to ascii
• new type of edge receptor for listening and spinning off streams. #137
• use "connection" communication from #131
• add token to xaddr (to use at the connection )
• create a stand-alone version of ceptr that can respond to an actual browser request.

[zippy]

52eaa6a adds socket handling to stream.c

[zippy]

82776e0 adds first pass at listener edge receptor.
still missing is a way to close the spun up reader/writers it spins up after receiving a connection, see #125