update readme

add dblclick/dbltap support for maximize

optimize touch areas of corners

fix missing pixel in height

improve event propagation

improve performance for complex windows contents

improve centered icons in minimized state

apply default font size

minor cleanups

improve touchevent delegation

fix z-index increment

support addClass and removeClass
round float position values

added built-in control classes

support show/hide
support position shorthands "right" and "bottom"