support plotting offset images

[simeonschaub]

plot(::OffsetMatrix{<:Colorant}) currently fails, because the recipe
assumes all axes are one-based. I wasn't sure how to add a test for
this, so I'd appreciate any pointers.

[codecov]

Codecov Report

Base: 90.64% // Head: 90.79% // Increases project coverage by +0.15% 🎉

Coverage data is based on head (2f3d7c1) compared to base (e01af5a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4615      +/-   ##
==========================================
+ Coverage   90.64%   90.79%   +0.15%     
==========================================
  Files          41       41              
  Lines        8777     8779       +2     
==========================================
+ Hits         7956     7971      +15     
+ Misses        821      808      -13     

Impacted Files	Coverage Δ
src/recipes.jl	84.58% <100.00%> (ø)
RecipesPipeline/src/RecipesPipeline.jl	100.00% <0.00%> (ø)
src/backends/pgfplotsx.jl	88.90% <0.00%> (+0.02%)	⬆️
src/components.jl	90.62% <0.00%> (+0.52%)	⬆️
RecipesPipeline/src/utils.jl	97.26% <0.00%> (+1.36%)	⬆️
RecipesPipeline/src/series.jl	93.58% <0.00%> (+2.56%)	⬆️
src/examples.jl	99.20% <0.00%> (+3.17%)	⬆️

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[BeastyBlacksmith]

I think adding a test that passes an OffsetArray to heatmap would catch this, no?
Would be enough to check that the recipe does not throw, no need for display.

[simeonschaub]

heatmap for OffsetArray is actually broken in other fun ways, but I added two tests for my initial use case.

[simeonschaub]

Any idea what's going on with the Conda errors?

[BeastyBlacksmith]

Not yet :/