add new bindings and event handlers

add two data binding

- left ... left position of this directive
- top ... top position of this directive

and add two event handlers

All handlers are called when resize action ends (it means this handler is called when 'MouseUp')

- onResizeX ... for x-axis. (use as on-resize-x)
- onResizeY ... for y-axis. (use as on-resize-y)