Remove extraneous double quote from bettermap module.js
Merge pull request #1227 from greem/master

Remove extraneous double quote from bettermap module.js
valuehistogram: new simple, value-based histogram

This change adds a new valuehistogram panel to support value-based
histograms.  Unlike the previous histogram panel which plots the data
using fixed time-interval buckets, this type of histogram buckets the
data according to the values themselves.  This type of graph provides
a high-level perspective of a field's value across the entire time
interval.
Merge remote-tracking branch 'jdve/histogram-values'