new mapnik-reference that declares all expressions for mapnik 3.x
use new mapnik-reference@6.0.0
remove back compat shim now that new mapnik-ref@6.0.0 is tagged
trim rendering results to avoid comparing ending newlines
quoting of enumerations is okay, so let this be okay to carto tests
text-name is an expression so flat string is okay - tweak issue297 to actually be invalid since text-face-name is not currently an expression
drop node v0.8.x testing on travis
mapnik ref: default to Mapnik 3.0.0
call this branch v0.14.0
Merge pull request #373 from mapbox/expressions

Al(most) all symbolizer properties as expressions