Create Responsify-Images.md

[retrocausal]

Add a recipe to illustrate generation and minification of images for the web

[QWp6t]

This PR has completely different code and editorial styles from all of the rest of the recipes. The editorial style differences are obvious. The code differences include using $ instead of gulp as well as the use of gulp-load-plugins, plus the abundance of code comments, and a few other minor differences.

I personally think it's easier for people new to gulp to see the recipes presented as consistently as possible, but on the other hand, the argument could be made that the "recipes" should reflect the editorial and code styles of the "chef" who writes them (again, I don't find this reasoning to be compelling enough, but I do recognize it has some merit).

[retrocausal]

@QWp6t

Agreed. Syntactically, the code in a recipe must align with its predecessors. made subtle changes here and there, but took care of dropping gulp-load-plugins, and replaced $ to gulp
Also replaced $$(previously aliasing gulp-load-plugins) to actual variable names as in their require declaration

[phated]

We are currently rewriting all the docs so I'm going to close this.