Use :nocov: sparingly.
Add tests.
Move registering of refresh event into Buffers.
Add simplistic Cursor class.
Render now accepts an options hash;

The only configurable is :top, which sets the top line of the interface. In the future this will mean we can scroll up and down through content which is longer than the interface's height.
Modify Terminal.output to take multiple streams;

- Move #clear_last_line into Esc.
Add more documentation.
Fix up Helpers#colour and Helpers#style;

- Add more documentation.
- Add tests.
Add more documentation and tests.
Add more documentation.