Document use of the development branch.
Get code coverage in Travis.
Remove this artifact.
Let's pretend that never happened.
Actually ignore the .coverage file.
Define the Window Manager ABC.
Define a built-in flow-control manager.

This one doesn't do anything new at the minute.
Plumb through the basic window manager.
Define _adjust_receive_window.
Replace Data frame handling.
Handle SETTINGS window size changes.
Tighten this test to exclude HEADERS.
Handle window resizing better.
Document the odd SETTINGS behaviour on the window.

Right now we handle a window resize a bit strangely. For the moment this
interface is probably OK, but it won't stay OK forever.
Allow pluggable window managers.
Confirm we reset window managers.
Mention pluggable flow control.
Comment typo.
Confirm import fails on unsupported versions.
Ensure the constructor is documented.