pull geometry forward in depth range to avoid far clipping plane
keep base layer from disappearing when post-processing depth values
put polygon and line outlines between layers to present z-fighting
(note: this needs more nuanced consideration when defining more styling/placement rules)
remove old style file
Merge branch 'master' into destroy

Conflicts:
	dist/tangram-worker.debug.js
	dist/tangram-worker.min.js
	dist/tangram.debug.js
	dist/tangram.min.js
leaflet layer remove test
stray console logs
don't upgrade browserify yet