Update to use async queryMany.
Use dev build ov vt-query-async
a little clean up
added handling and tests for tiles w/o the queries layer (that exist)
Merge pull request #51 from mapbox/async-tests

added handling and tests for tiles w/o the queries layer (that exist)
Split out post-queryMany data conversion so it can be benchmarked.
Call .attributes() once per feature and store the results.
Remove distance sort -- hits are distance sorted by vt.queryMany upstream.
Switch to basic for loops for performance.
Remove unused createNulls.
Merge pull request #53 from mapbox/bench-convert

Bench convert
Merge branch 'new-interpolate' into async-line-interpolation

Conflicts:
	index.js
	package.json
Merge branch 'async-line-interpolation' into new-interpolate