add svg import test

HEADER.js

@@ -55,7 +55,7 @@ fabric.SHARED_ATTRIBUTES = [
   'stroke', 'stroke-dasharray', 'stroke-linecap', 'stroke-dashoffset',
   'stroke-linejoin', 'stroke-miterlimit',
   'stroke-opacity', 'stroke-width',
-  'id', 'paint-order',
+  'id', 'paint-order', 'vector-effect',
   'instantiated_by_use', 'clip-path'
 ];
 /* _FROM_SVG_END_ */

test/visual/assets/vector-effect.svg

@@ -0,0 +1,6 @@
+<?xml version="1.0" standalone="no" ?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="150" height="150" xml:space="preserve">
+  <rect x="1" y="1" width="20" height="20" transform="matrix(4 0 0 1.5 0 0)" stroke-width="3" vector-effect="non-scaling-stroke" fill="none" stroke="red" />
+  <rect x="4" y="4" width="20" height="20" transform="matrix(4 0 0 1.5 0 0)" stroke-width="3" fill="none" stroke="blue" />
+</svg>

test/visual/svg_import.js

@@ -85,6 +85,7 @@
     'clippath-6',
     'clippath-7',
     'clippath-9',
+    'vector-effect'
     //'clippath-8',
   ].map(createTestFromSVG);