CI compatibility changes; PR feedback

Author: monfera

src/traces/parcoords/base_plot.js

@@ -67,5 +67,6 @@ exports.toSVG = function(gd) {
         });
     }
 
+    imageRoot.selectAll('*').remove();
     canvases.each(canvasToImage);
 };

test/image/baselines/parcoords.png renamed to test/image/baselines/gl2d_parcoords.png

@@ -23,8 +23,7 @@ function func(config) {
         'tests/gl_plot_interact_test.js',
         'tests/gl_plot_interact_basic_test.js',
         'tests/gl2d_scatterplot_contour_test.js',
-        'tests/gl2d_pointcloud_test.js',
-        'tests/parcoords_test.js'
+        'tests/gl2d_pointcloud_test.js'
     ];
 
     // if true, Karma captures browsers, runs the tests and exits