Fixed VistualRegressionTests install

Author: mfalt

src/ControlExamplePlots.jl

@@ -1,9 +1,13 @@
 module ControlExamplePlots
 
-Pkg.status("VisualRegressionTests") == nothing &&
-  error("VisualRegressionTests needs to be installed, get it at https://github.com/tbreloff/VisualRegressionTests.jl")
-
-using ControlSystems, Plots, VisualRegressionTests
+try
+    Pkg.installed("VisualRegressionTests")
+catch
+    warning("VisualRegressionTests needs to be installed to test plots, adding now:")
+    Pkg.clone("https://github.com/tbreloff/VisualRegressionTests.jl.git")
+end
+
+using ControlSystems, Plots
 
 include("genplots.jl")
 

src/genplots.jl

@@ -19,6 +19,7 @@ function genplots(funcs, refs; eps=1e-3, kwargs...)
         testf(fn) = png(funcs[i](), fn)
         results[i] = test_images(VisualTest(testf, ref); eps=eps, kwargs...)
     end
+    results
 end
 
 @doc """funcs, refs = getexamples()