small improvements

Source/Svg.csproj

@@ -16,7 +16,7 @@
     <OldToolsVersion>3.5</OldToolsVersion>
     <UpgradeBackupLocation>
     </UpgradeBackupLocation>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
     <IsWebBootstrapper>false</IsWebBootstrapper>
     <SccProjectName>
     </SccProjectName>

Source/SvgElementCollection.cs

@@ -108,6 +108,7 @@ namespace Svg
                     }
                 }
                 
+                //if all checked, set parent
                 item._parent = this._owner;
             }
         }

Source/SvgExtentions.cs

@@ -23,6 +23,11 @@ namespace Svg
             r.Height = bounds.Height;
         }
         
+        public static RectangleF GetRectangle(this SvgRectangle r)
+        {
+            return new RectangleF(r.X, r.Y, r.Width, r.Height);
+        }
+
         public static string GetXML(this SvgDocument doc)
         {
             var ret = "";