Add unit tests for orderby that uses minimal data.
add tests for drop fx
stable sort preserves ties in orderby
update test fixtures
be clearer about whats going on
tests for garbage collector
Merge branch 'orderby-unit-test' of github.com:mapbox/vtfx-drop into orderby-unit-test
add garbage collector test
rename cleaner and drop tests
add unit test for linelabel
update comments on tests
update linelabel test to check id
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