Move image scaling tools from photutils to imageutils

[larrybradley]

Sound good? Let me know and I can do that.

Actually, most of the tools in photutils.utils could go in imageutils.

[cdeil]

IMO everything in photutils.utils is of more general use than photutils and should either go in this imageutils repo or in scikit-image.

My personal preference would always be to put functions that are not specific to astronomy in any way into scikit-image, but obviously there is not agreement on this. (We already have created astropy.convolution, astropy.units, astropy.modeling and astropy.stats which contain very little astronomy-specific functions instead of contributing to the scipy ecosystem, which I find bizarre.)

On the other hand I don't have time to make pull requests for scikit-image at the moment, so moving photutils.utils into imageutils now would be OK with me (let's wait for https://github.com/astropy/photutils/pull/123 to be merged first though).

[cdeil]

I wanted to set @larrybradley as Assignee, but I can't.

@eteq or @astrofrog Could you please change the settings for this repo so that "astropy-contributors" can be assigned to imageutils issues?

And please give @larrybradley merge privileges for this repo.

[astrofrog]

Done!

[larrybradley]

@astrofrog Thanks!