added mocks for image test

Author: archmoj

test/image/baselines/gl2d_lines_almost_horizontal_vertical.png

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+{
+  "data":
+  [
+    {"mode":"lines", "line":{"width": 4}, "x":[1, 2, 3, 4], "y":[4, 4, 4.0001, 3.9999], "type":"scatter", "name":"scatter almost horizontal"},
+    {"mode":"lines", "line":{"width": 4}, "x":[1, 2, 3, 4], "y":[3, 3, 3.0001, 2.9999], "type":"scattergl", "name":"scattergl almost horizontal"},
+    {"mode":"lines", "line":{"width": 4}, "x":[1, 2, 3, 4], "y":[2, 2, 2, 2],           "type":"scattergl", "name":"scattergl horizontal"},
+    {"mode":"lines", "line":{"width": 4}, "x":[1, 2, 3, 4], "y":[1, 1, 1, 1],           "type":"scatter", "name":"scatter horizontal"},
+    {"mode":"lines", "line":{"width": 4}, "y":[1, 2, 3, 4], "x":[4, 4, 4.0001, 3.9999], "type":"scatter", "name":"scatter almost vertical"},
+    {"mode":"lines", "line":{"width": 4}, "y":[1, 2, 3, 4], "x":[3, 3, 3.0001, 2.9999], "type":"scattergl", "name":"scattergl almost vertical"},
+    {"mode":"lines", "line":{"width": 4}, "y":[1, 2, 3, 4], "x":[2, 2, 2, 2],           "type":"scattergl", "name":"scattergl vertical"},
+    {"mode":"lines", "line":{"width": 4}, "y":[1, 2, 3, 4], "x":[1, 1, 1, 1],           "type":"scatter", "name":"scatter vertical"}
+  ], "layout": {"width":800, "height":600, "xaxis":{"range":[4.5, 0.5]}, "yaxis":{"range":[4.5, 0.5]}, "title": "exact and approximate horizontal and vertical lines using scatter and scattergl with reversed ranges" }
+}

test/image/baselines/gl2d_scattergl_simple_line_reversed_ranges.png

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+{
+  "data":
+  [
+    { "type": "scattergl", "mode": "lines", "x": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], "y": [0, 1, 0, 7, 7, 0, 2, 4, 3, 0], "line": { "width": 10, "dash": "solid" } },
+    { "type": "scattergl", "mode": "lines", "y": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], "x": [0, 1, 0, 7, 7, 0, 2, 4, 3, 0], "line": { "width": 10, "dash": "solid" } }
+  ], 
+  "layout": {"width":800, "height":600, "xaxis":{ "range": [-1, 11] }, "yaxis":{ "autorange": "reversed" }, "title": "simple scatter lines (without markers or text) with reversed ranges" }
+}