ngResizable Locks Height When rzHandles Includes Only e, w

[Yamazaki93]

Hi,
Great plugin first of all! Don't know if this is by design, but ngResizable locks the height of the element when the handles only include either 'e' or 'w'. The following roughly illustrate the problem

<div style="position:relative">
  <div ngResizable rzHandles="e" style="height: 100%;">
    <!--Before drag: This div's height match the parent regardless of parent size-->
    <!--After dragging the right handle: This div height is set to the height at the time of dragging. This issue shows up after the parent div resizes for any reason. The height cannot be changed since there's no handle on n or s side-->
  </div>
</div>

Took a brief look at angular-resizable.directive.ts, it seems doResize hard set the height and width regardless of the handles. Maybe doResize can check _direction before setting the container size?
Similar problem on width could happen if the handle only includes either s, n

[xieziyu]

@Yamazaki93
Thank you. I will review your PR.