use nunicode conditional case mapping (lowercase)
correct _nu_tolower/_nu_toupper usage
Merge branch 'master' into nunicode
update nunicode version
Merge branch 'master' into nunicode
use ```const var&``` notation in public interface
Merge pull request #657 from mapbox/nunicode

Nunicode
Merge branch 'master' of github.com:mapbox/mapbox-gl-native into android-mason
Use new libnu version on Android
Debug access keys on travis