Major refactor of javascript

[johntyree]

This is a massive refactor of the client code, splitting most of it out into modules so that everything is not running rampant in the global namespace.

I'm still iterating on it.

http://www.adequatelygood.com/JavaScript-Module-Pattern-In-Depth.html

Features picked up along the way in anticipation of others:

• Press space to pause and restart
• Jump to viewing a particular frame with mapView.showTimeStep()
• Define a global integer showFPS to output a FPS measurement every showFPS frames.
• Better caching of lines (with barbs) and API calls

[johntyree]

I'm calling a {date: <Date>, vectors: [polylines]} object a "vector frame" and referring to a data snapshot at a particular date as a "frame."

[johntyree]

Ok, as it is I've isolated basically everything down to setLatLngs in leaflet itself. It's not going to get any better.

[johntyree]

:scream: here we go.....

[kjordahl]

:+1: Nice step forward.

[kjordahl]

LGTM, merging.