Changed code to separate graph stacking logic by axis.
Merge branch 'CSG/MultiAxis-StackedGraph' into CSG-v1.0.1
Fix ghosting issues when viewing graphs with browser zoomed out. Closes #440.
Merge pull request #449 from gregoryjordan/master

Fix ghosting issues when viewing graphs with browser zoomed out.
Adding test for multi axis stacking
Merge branch 'CSG/MultiAxis-StackedGraph' into CSG-v1.0.1
Merge pull request #313 from CSGOpenSource/CSG-v1.0.1

Stack series per axis
add date/time axis option to benchmark
Point README at new issue tracker & Stack Overflow
Add `rangeSelectorCombinedSeries` option
rework option as showInRangeSelector
Only plot a point in range selector if it changes the x-value
Add a test for range-selector + stepPlot
only apply optimization when stepPlot=false