plotly_data for Surface; improve add_backend(:plotlyjs)

src/backends/plotly.jl

@@ -338,6 +338,7 @@ function plotly_close_shapes(x, y)
 end
 
 plotly_data(v) = collect(v)
+plotly_data(surf::Surface) = surf.surf
 plotly_data{R<:Rational}(v::AbstractArray{R}) = float(v)
 
 # get a dictionary representing the series params (d is the Plots-dict, d_out is the Plotly-dict)

src/backends/plotlyjs.jl

@@ -13,10 +13,12 @@ const _plotlyjs_scale       = _plotly_scale
 function add_backend(::PlotlyJSBackend)
     if !is_installed("PlotlyJS")
         Pkg.add("PlotlyJS")
-        @eval import Blink
-        Blink.AtomShell.install()
+    end
+    if !is_installed("Rsvg")
         Pkg.add("Rsvg")
     end
+    @eval import Blink
+    Blink.AtomShell.install()
 end