Plotly meta-issue

[tbreloff]

• check colorbar to hide/show (legend = false not working for heatmap and most backends #199)
• proper javascript setup in IJulia (plotly backend in notebook #174, JavaScript error of Interact after plotly() #164)
• custom shapes (probably need to add polygon annotations to subplot?)
• vector fillranges (also polygons?)
• robust PNG generation (PlotlyJS testing #191)
• clims (Feature Request: Color Limit in Heatmaps #293)
• updated supported args (Plotly meta-issue #316 (comment))
• add and implement hover attribute
• plotlyjs subplots don't work
• line segments, line_z (Support color gradients/vectors for line segments #218)
• Interact.jl support for plotlyjs
• handle discrete axes
• might need to apply transformation first when setting axis scale
• dpi (Image DPI control ? #173)
• axes are auto-linking? (Inconsistent link behavior between PyPlot and PlotlyJS backends #406)
• keep border when removing ticks? (Inconsistent ticks behavior between PyPlot and PlotlyJS backends #407)
• latex and pdf output (Custom yticks in PGFPlot not working #434 (comment))