add test fixture and image comparison
don't overwrite global symbol basename
fail when there are test errors

[skip ci]
update headless testing to be configurable
Merge branch 'master' of github.com:mapbox/mapbox-gl-native
fix compile errors
add antialiasing test
CF template for travis testing user and encrypted creds.
Merge branch 'master' into malformed
Merge branch 'malformed' into fuzz-pipe
fix gypfile