Graph widgets can now display dots.
Merge branch 'feature/issue-36-graph-widget-hover-effect' into feature/issue-38-optional-graph-widget-markers

Conflicts:
	diamondash/public/js/diamondash.js
	diamondash/widgets/graph/graph-widget.js
Fixed a bug in the graph widget stylesheet causing pointer events to not be set as disabled for dots
The hover dot size is now differs depending on whether or not the graph is dotted.
Removed unnecessary, commented out lines.
Gave the d3 translate attr changes some spacing for readability (based on review comment)
Gave the graph widget SVGs a less generic css class name.
Added '.exit().remove()'s to remove the dot dom elements no longer joined to datapoints.
Merge branch 'feature/issue-38-optional-graph-widget-markers' into develop