FIX: properly round % so they add up to 100 in polls

plugins/poll/assets/javascripts/lib/even-round.js.es6

@@ -0,0 +1,8 @@
+// stolen from http://stackoverflow.com/a/13485888/11983
+export default (percentages) => {
+  const off = 100 - _.reduce(percentages, (acc, x) => acc + Math.round(x), 0);
+  return _.chain(percentages)
+          .sortBy(x => Math.round(x) - x)
+          .map((x, i) => Math.round(x) + (off > i) - (i >= (percentages.length + off)))
+          .value();
+};