processes image content in XML files. No tests.

If you generate atom or RSS feeds then you need to link to the image files with the revised filenames. It also requires a match on absolute paths. Wasn't sure how to create a test for it or run it.

Also had to change the usemin config in Gruntfile.js
html: ['<%= config.dist %>/{,**/}*.{html,xml}'],
Hopefully it will be useful to someone else.