Update _originalImageWidth & _Height

[Coeur2Boeuf]

On rotate image, the _originalImageWidth & _originalImageHeight are not updated... So, the result was on the old value.
This example, fix this issue.

[webmasterMeyers]

This fix works for me on v2.6.4, please merge!

[michael-letcher]

Fixes #699 & #668

[tristanbenier]

This works for me as well on v2.6.4, please merge it !

[Uleertel]

I tried to use this fix by using the fork from Coeur2Boeuf and it didn't work.
The explanation is that on the master branch of croppie there is already a fix for it just a few lines after this fix!
The fork by Coeur2Boeuf is based on the master so we have a double fix that cancel each other....
So either use the fix of Coeur2Boeuf or use the master branch but do not use both!
So what we need really is a 2.7 from master. Someone knows if master is stable as it is?

[andrewflon]

This works for me!