Asset pipeline optimizations

[alexkahn]

Get an asset pipeline together that does the following:

• Concatenates CSS and JavaScripts [X]
• Minifies the concatenated source files [X]
• Optimizes images []
• Uses grunt task(s) to build assets [X]
• Watch asset files for changes and trigger a build for fast development []

Things to refactor:

• Make sure file concatenation can manage passing top-level objects to IIFEs used for initialization, redesign js flow to make this more efficient and modular client-side code.