templates/leaflet_base.html:

Reorganized script includes. The custom app code should come last.
static/js/base_leaflet_app.js:

`map` initialization needs to be global for wax to work.

I don't like this, but at least I know now.
static/js/base_leaflet_app.js:

Made the base app methods public.
static/js/hazard_models.js:

Fixed wax interaction (the `map` object needs to be in global scope,
i.e., without declaring a new `var`).