remove uv.h dependency in util/time.hpp
remove uv.h dependency from header files
make output empty
remove uv.h dependency in darwin-specific code
fix gyp builds
include correct uv header in test fixture
bump cocoa dependency
Merge pull request #410 from mapbox/no-uv-headers

remove header dependency on uv.h
bump cocoa bindings
Merge branch 'master' of https://github.com/mapbox/mapbox-gl-native

Conflicts:
	mapboxgl.gyp
Merge branch 'no-uv-headers'
Merge branch 'master' into rasterize
[skip ci]