static/css, static/js/base_leaflet_app.js:

Fixed some minor (but annoying) styling issues around the margins.

All is well now with the leaflet apps.
exposure/templates/exposure/building_form.html:

Fixed a bad link to a gif image.
templates/leaflet_base.html:

Added jquery.ui to base dependencies.
exposure/templates/exposure/export.html:

Removed a stylesheet link which now exists in the parent template.
templates/explore_leaflet.html:

Rebased the explore template on the new leaflet base template.
static/js/explore_leaflet.js:

Rebased the explore app on the new app template.