Add mocks and baseline images

Author: camdecoster

test/image/baselines/scattermap_dynamic_defaults.png

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+{
+  "data": [
+    {
+      "hovertext": ["San Marino", "Cairo", "Istanbul", "Trondheim"],
+      "lat": [43.9360958, 30.06263, 41.01384, 63.43049],
+      "lon": [12.4417702, 31.24967, 28.94966, 10.39506],
+      "marker": { "color": "#f00" },
+      "mode": "markers",
+      "type": "scattermap"
+    }
+  ],
+  "layout": { "width": 900, "height": 600 }
+}

test/image/baselines/scattermap_dynamic_defaults_center_set.png

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+{
+  "data": [
+    {
+      "hovertext": ["San Marino", "Cairo", "Istanbul", "Trondheim"],
+      "lat": [43.9360958, 30.06263, 41.01384, 63.43049],
+      "lon": [12.4417702, 31.24967, 28.94966, 10.39506],
+      "marker": { "color": "#f00" },
+      "mode": "markers",
+      "type": "scattermap"
+    }
+  ],
+  "layout": {
+    "map": {
+      "center": { "lat": 0, "lon": 0 }
+    },
+    "width": 900,
+    "height": 600
+  }
+}