Create first html standalone example

Based on the Khan Academy's "Welcome to Computer Science" program, this
html page renders an ugly face using processing. It demonstrates how to
glue the code from KA into an html page.
Load processing code on the fly from Khan Academy

This commit has the necessary html and javascript boilerplate to load a
separate file with processing.js instructions from the Khan Academy's
code editor.
Merge remote-tracking branch 'gallardo-git/master'