dropkey
Add tests
Update to chainable
Merge branch 'orderby-unit-test' of github.com:mapbox/vtfx into unit-test-dropkey
Merge branch 'master' of github.com:mapbox/vtfx into unit-test-dropkey
Stricter options testing
Remove redundant GC call
Merge pull request #33 from mapbox/unit-test-dropkey

Unit test dropkey