Fracking: Kill gas sooner and move slower, so no gas in air
Climate: Move scripts to js folder
Climate: Move controls to common script; add jquery sliders

Controls have some minimal branching based on the model type
passed in from the html page, but for the most part it
simply depends on jquery functions not being called when
the selector doesn't exist.

Added in jquery sliders because input-range elements are not
well supported, especially in firefox.

Added some minimal styling for jquery sliders, making them look
a little more lab-like
Climate: Update follow buttons when spotlight agent dies
Climate Ocean: Fix killing of spotlight agent in overridden method
Climate: Subscript CO2
Climate: Allow interactives without graphs
Prettify index page
Climate: Add Variant 1
Climate: Add Variant 2
Climate: Add model-bottom layout location
Climate Ocean: Add ability not to have vapor agents
Climate Ocean: Add ability to set CO2 spawn rate; speed ocean change
Climate: Add Variant 3
Climate Ocean: Make vapor increase rate settable
Climate: Add Variant 4
Climate: Fix resetting of models with initial variations