Have option.matchShapes control conversion to SVG polygon elements as well.

Closes #753

src/item/Item.js

@@ -2084,8 +2084,8 @@ var Item = Base.extend(Emitter, /** @lends Item# */{
      * @option [options.precision=5] {Number} the amount of fractional digits in
      * numbers used in SVG data
      * @option [options.matchShapes=false] {Boolean} whether path items should
-     * tried to be converted to shape items, if their geometries can be made to
-     * match
+     * tried to be converted to SVG shape items (rect, circle, ellipse, line,
+     * polyline, polygon), if their geometries match
      *
      * @param {Object} [options] the export options
      * @return {SVGElement} the item converted to an SVG node

src/project/Project.js

@@ -641,8 +641,8 @@ var Project = PaperScopeItem.extend(/** @lends Project# */{
      * @option [options.precision=5] {Number} the amount of fractional digits in
      * numbers used in SVG data
      * @option [options.matchShapes=false] {Boolean} whether path items should
-     * tried to be converted to shape items, if their geometries can be made to
-     * match
+     * tried to be converted to SVG shape items (rect, circle, ellipse, line,
+     * polyline, polygon), if their geometries match
      *
      * @param {Object} [options] the export options
      * @return {SVGElement} the project converted to an SVG node

src/svg/SVGExport.js

@@ -114,7 +114,8 @@ new function() {
     }
 
     function exportPath(item, options) {
-        if (options.matchShapes) {
+        var matchShapes = options.matchShapes;
+        if (matchShapes) {
             var shape = item.toShape(false);
             if (shape)
                 return exportShape(shape, options);
@@ -124,7 +125,7 @@ new function() {
             attrs = getTransform(item._matrix);
         if (segments.length === 0)
             return null;
-        if (item.isPolygon()) {
+        if (matchShapes && !item.isPolygon()) {
             if (segments.length >= 3) {
                 type = item._closed ? 'polygon' : 'polyline';
                 var parts = [];

test/tests/SVGExport.js

@@ -20,7 +20,7 @@ test('Export SVG line', function() {
         y2: 45
     };
     var path = new Path.Line([attrs.x1, attrs.y1], [attrs.x2, attrs.y2]);
-    equals(path.exportSVG(), createSVG('line', attrs));
+    equals(path.exportSVG({ matchShapes: true }), createSVG('line', attrs));
 });
 
 test('Export SVG rect', function() {