Fix bug where components would stay highlighted

When it did $c.css(pos_axis, ""), pos_axis was undefined which caused
some error deep within the bowels of jQuery...
Since it happened on mouseup, it didn't put the component in a window
(which isn't actually what I want it to do anyways) and just stayed
"dragging-y" / "highlighted" / "ghosted" / *sigh*
Update TODO & README