Croppie: Add the ability to set the viewport's minSize

[guschnwg]

https://github.com/Foliotek/Croppie/blob/680db73a21c43fbaef26bd3d4fbb2dbdb63c2341/croppie.js#L468

I would like to be able to set the viewport's minSize as i can't set images smaller than 50x50 pixels.

[estevanjantsk]

Up!

[thedustinsmith]

I'm open to PR's for this.

[xty1992a]

when you got the image data, you can create a canvas and put the image into canvas, then you can got any size what you want.

[guschnwg]

@xty1992a

I want to do it with the library, not manipulating the image AFTER i've cropped it.

If I needed to insert into a canvas and crop a a image every time I wanted an image smaller than 50x50, what is the point of using the lib?

Check the PR I made