get toggle redraws into the RedrawingAspect
Remove Line#move - should not be necessary
Specs green again
Redraw elements that are moving around with _position
Removed 2 specs that tied redrawing to #update_position instead of _position
Merge branch 'master' into more_accurate_redraws
make sample14 work

* redrawing also after left= etc.
* refactored the initialize of Dimension for the hash initialization
  to map to the argument initialization.
Only reposition elements if their position actually changed

* dramatically improves performance of simple-draw.rb
Merge pull request #577 from shoes/more_accurate_redraws

More accurate redraws