Squash sparse array as d3 balks. (#20)
Squash sparse array as d3 balks. (#20)

* Squash sparse array as d3 balks.
benlyall/donations-visualiser,river-jade/donations-visualiser,benlyall/donations-visualiser,benlyall/donations-visualiser,river-jade/donations-visualiser,benlyall/donations-visualiser,river-jade/donations-visualiser,river-jade/donations-visualiser