Added fixedWidth and fixedHeight options. Cropping one image for multiple images and sizes

[celilunver]

… and multiple sizes image same time.

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• [ ] The commit message follows our guidelines.
• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

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What kind of change does this PR introduce?

• [ ] Bugfix
• [x] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other, Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [ ] No

Other information

[fengyuanchen]

Does this is the same as the width and height options of the Cropper.js's getCroppedCanvas method?

[celilunver]

I tried but ist not work because when cropping image one aspect. And when i crop for different sizes rounded pixels not equal my width and height values this reason is one aspect ratio

[fengyuanchen]

For cropping an image with different aspect ratio, you can change the aspect ratio by the setAspectRatio method before do the cropping.

[fengyuanchen]

Sorry, thanks for your PR, but I cannot merge this.