add tests for parameters
update test fixtures since ties return 0 now
Merge pull request #32 from mapbox/orderby-unit-test

Add unit tests for orderby that uses minimal data
Merge branch 'master' of github.com:mapbox/vtfx-drop into test-params
test parameters in unit tests
update parameter doc
more sensible defaults
add tests for parameters
remove unit tests for parameters
note that if field === field, studio ui will autopopulate
Merge pull request #36 from mapbox/test-params

Test parameters
Merge branch 'master' of github.com:mapbox/vtfx into unit-test-dropkey