Added checking _direction when applying styles

[Yamazaki93]

Hi,
I've included changes here I think could solve #116, couldn't find the dev branch so opened the PR to master.

[xieziyu]

This change will break [rzAspectRatio] function when only vertical or horizontal handles set. It still needs to apply height or width changes.

I will create a dev branch, then you can submit PR to it.

[Yamazaki93]

Ah yes you are absolutely right, will change that and update the PR

[Yamazaki93]

Ok, so the reasoning behind ed0737a :
If aspect ratio is set -> the user wants resizable size aspect ratio should be maintained -> both width and height need to be set.
If apsect ratio is not set -> the user doesn't want aspect ratio to be maintained -> only setting width or height depending on handles available
So if only w or e handle is available and aspect ratio is not set, dragging them inherently changes the aspect ratio. We then don't set the height, allowing the other styles to apply, does that sound about right?
Thanks!

[xieziyu]

Thanks, I will publish it soon.