Remove min/maxzoom properties from individual layer defs + UI.
also remove min/maxzoom doc from readme
Merge branch 'master' into no-layer-zooms
Update source vector_layers key with removal of min/maxzoom.
Merge branch 'no-layer-zooms' of github.com:mapbox/tm2 into no-layer-zooms
Merge branch 'master' into no-layer-zooms
Removes min/maxzoom props from exported vector_layers keys.
Merge pull request #337 from mapbox/no-layer-zooms

Remove min/maxzoom properties from individual layer defs + UI.