Add initial boilerplate code for histogram widget
Merge branch 'develop' into feature/issue-126-add-histogram-widget
Change the histogram widget's config to expect a target instead of a series of metrics
Move .axis styling out of the graph widget's stylesheet so we can use it for the histogram widget
Add histogram widget js files to the paths config
Boilerplate for histrogram widget view
Refactor hover markers out of graph widget into a generic chart component used by XYChartView
Move .hover-marker styling into its own stylesheet (now that it is the css counterpart for a reusable component)
Change HistogramModel's range to be from 0 to its highest y value
Fix histogram model fixture to only contain a single metric (what the server-side gives us)
Merge branch 'develop' into feature/issue-126-add-histogram-widget
Get the basics working for the histogram view
Rebuild
Fix global leak
Merge branch 'feature/issue-126-add-histogram-widget' into develop