Share optimized image into several locations if size and format are identical

[cawa-93]

Enter your suggestions in details:

Let's say I have two components for showing same image:

<img src="my-pic.png" imagick="png 300@2"/>
<img src="my-pic.png" imagick="png 600@2"/>

First one resolved into my-pic-300w.png and my-pic-300w@2.png. Second one into my-pic-600w.png and my-pic-600w@2.png. The problem is that files my-pic-300w@2.png and my-pic-600w.png are completely identical but they generated twice, stored in cache twice, stores in fs twice and loaded into client twice.

Maybe it have sence to resolve file size and share one file into several locations? So in my example instead of having 4 files we will get only 3: my-pic-300w.png, my-pic-600w.png, my-pic-1200w.png.