serve index on /examples, added 404 response
added site/commands/trackPageview for analytics

passing `env` through layout.jade to toggle analytics account
stacked-drawer uses translateZ(0) hack to become own layer
layout with env variables passed to require.js
examplesConfig updated to use env module for urls

made `window` explicit in perlinNoiseCanvas `requestAnimationFrame`
updated some copy in footer & index

retabbed envs.js and flattened organization, retabbed tcolorPjs.pde