Support variable export sizes (including higher resolution)

[aulneau]

I went through the issues and couldn't find this in there.

It would be fantastic to be able to export and larger sizes 👍

Love what you've got so far!

[fregante]

Definitely larger sizes are needed. Twitter won't even fill most of the image's available area for small snippets:

[photonstorm]

@bfred-it you sure the twitter issue shown in the picture above wasn't related to #145 ? I was getting loads of excess blank space on the sides of my PNGs, which would absolutely cause the issue you shown in your twitter grab.

[fregante]

Oh wow you're absolutely right, the image has transparent padding around it. Is that fix not deployed yet? I had this issue 4 hours after the PR was merged.

[photonstorm]

No, don't think it's deployed, as it still happens for me when I save a PNG. Hopefully won't be long though :)