Updated to-do list.

Simplified the API: There's only one constructor, and it does everything necessary to initiate the stream. StartSession() and Roster.Update() have both been eliminated.

Updated to-do list.

gofmt

Code reorder and doc cleanup.

Removed an unused parameter.

Made layers 1 and 3 more modular, shrinking the surface area of the coupling between them.

Function renames and improved doc.

Changed the inputControl channel to send a custom type.

gofmt

Renamed HandleStanza to SetCallback.

Split stream.go into layer1, layer2, layer3, and sasl.

Removed copyright statements.

Doc update.

Don't close the wrong end of a channel. But if we get an error, we can close the underlying socket.

Initial roster contents look like a result iq.

Doc update.

Start reading from the recv channel earlier.

Simplified and debugged the filter logic.

Fixed another logic error, caused by a shadowed variable name.

Fixed some logic errors and initialized some things that needed to be initialized.

Removed some unused code.

Fixed reversed-logic error in checking for duplicate stanza extension types.

Address a bug that can happen if no SRV records can be found.