Transform image before inlining

[emilos]

There are cases when you add different transformations to the images with css. In some cases it's possible to reproduce it (if it's not dynamic) and apply to the image directly.

We could apply some of the transformations via the compiler (e.g. shrink the image, add a layer) with transformations, e.g.

<img src="/foo,png" inline resize="100x100">