Convert speeds to vars.
Fade out menu instead of sliding it.
Fade out more slowly, stop previous animations.
Revert "Fade out menu instead of sliding it."

This reverts commit edc181982f95849f274ed0cad1528993155b0c26.

Conflicts:
	focus.js
Add a var to toggle slide/fade.
Add a toggle. Fixes #13.
Cleanup.
Turn it on by default.