CLN: Tabs -> spaces
ENH: Cach velocity vectors to avoid reading JSON data after the first time through
DOC: Comment string for points
Merge pull request #10 from enthought/enh/cache-velocities

Cache velocity data
Merge remote-tracking branch 'origin/master' into enh/vector-direction

Conflicts:
	frontend/js/vector.js
Closure linter fixes
Fix broken merge
Ensure drawing updates are asynchronous
Merge pull request #13 from enthought/enh/async-vector-update

Ensure drawing updates are asynchronous
Merge remote-tracking branch 'origin/master' into enh/vector-direction

Conflicts:
	frontend/js/vector.js