Fix baseline image differences resulting from parallel work [2951]

- Parallel work being pie titles and 3d tick adjustments.
plotly · rmoestl · Oct 25, 2018 · Sep 27, 2018 · Sep 27, 2018 · Oct 11, 2018
commit d2dbd28b8663e7ad489bb0d04219ae6e339c48de
diff --git a/test/image/baselines/bar_attrs_relative.png b/test/image/baselines/bar_attrs_relative.png
diff --git a/test/image/baselines/grid_subplot_types.png b/test/image/baselines/grid_subplot_types.png
diff --git a/test/image/baselines/pie_title_middle_center.png b/test/image/baselines/pie_title_middle_center.png
diff --git a/test/image/baselines/pie_title_middle_center_multiline.png b/test/image/baselines/pie_title_middle_center_multiline.png
diff --git a/test/image/baselines/pie_title_pull.png b/test/image/baselines/pie_title_pull.png
diff --git a/test/image/baselines/plot_types.png b/test/image/baselines/plot_types.png