QAA-2440: add nv.models.brushControl:
based on nv.models.lineChart, brush code from nv.models.lineChartWithFocus,
.
dispatch brushstart, brush, brushed events,
set interactive=false on chart lines,
remove tooltip, interactiveLayer, keep legend
.
set dev=false; in core.js - I think this should be the default - no problem to set dev=true; when in development. otherwise is a gotcha when running production build.
QAA-2440: build nv.d3.js
QAA-2440: rebase feature-brushControl, run production build