New SVGContext and testing

Creates new SVGContext, to remove dependency on Raphael.
Replaces runTest & runRaphaelTest with runTests(), which runs test in
backgrounds as configured in vexflow_test_helpers.js

docs/sandbox.html

@@ -8,8 +8,8 @@
     type="text/css" />
 
   <!-- VexFlow Compiled Source -->
-  <script src="../build/vexflow/vexflow-debug.js"></script>
-  <script src="../support/vexflow-min.js"></script>
+  <script src="../build/vexflow-debug.js"></script>
+<!--  <script src="../build/vexflow-min.js"></script> -->
 
   <!-- Support Sources -->
   <script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>

src/raphaelcontext.js

@@ -5,6 +5,10 @@
 //
 // Copyright Mohit Cheppudira 2010
 
+// ## Warning: Deprecated for SVGContext
+// Except in instances where SVG support for IE < 9.0 is
+// needed, SVGContext is recommended.
+
 /** @constructor */
 Vex.Flow.RaphaelContext = (function() {
   function RaphaelContext(element) {

src/renderer.js

@@ -33,6 +33,7 @@ Vex.Flow.Renderer = (function() {
 
   Renderer.buildContext = function(sel,
       backend, width, height, background) {
+
     var renderer = new Renderer(sel, backend);
     if (width && height) { renderer.resize(width, height); }
 
@@ -52,6 +53,12 @@ Vex.Flow.Renderer = (function() {
         width, height, background);
   };
 
+  Renderer.getSVGContext = function(sel, width, height, background) {
+    return Renderer.buildContext(sel, Renderer.Backends.SVG,
+        width, height, background);
+  };
+
+
   Renderer.bolsterCanvasContext = function(ctx) {
     if (Renderer.USE_CANVAS_PROXY) {
       return new Vex.Flow.CanvasContext(ctx);
@@ -123,8 +130,13 @@ Vex.Flow.Renderer = (function() {
           "Can't get canvas context from element: " + sel);
         this.ctx = Renderer.bolsterCanvasContext(
             this.element.getContext('2d'));
+
       } else if (this.backend == Renderer.Backends.RAPHAEL) {
         this.ctx = new Vex.Flow.RaphaelContext(this.element);
+
+      } else if (this.backend == Renderer.Backends.SVG) {
+        this.ctx = new Vex.Flow.SVGContext(this.element);
+
       } else {
         throw new Vex.RERR("InvalidBackend",
           "No support for backend: " + this.backend);