Simple implementation for crossOrigin support

[StigZord]

I have added crossOrigin param to the hook for handling images from different domains.
To somewhat prevent accidental setting of crossOrigin, I implemented it the way that user need to actually write the string value Anonymous to correctly set the crossOrigin rule.

Let me know what you think.
Also if you are ok with this PR, should I bump the version too?

[lavrton]

I think we should set it to anonymous by default but a user can change it.

module.exports = function useImage(url, crossOrigin) {
  //  code
  img.crossOrigin = crossOrigin || 'Anonymous';
}

[StigZord]

In my opinion for safety reasons it actually shouldn't be enabled by default and instead should be a conscious decision to use.