a few defaults and version bump

Source/Basic Shapes/SvgCircle.cs

@@ -137,7 +137,8 @@ namespace Svg
         /// </summary>
         public SvgCircle()
         {
-            
+            CenterX = new SvgUnit(0.0f);
+            CenterY = new SvgUnit(0.0f);
         }
 
 

Source/Basic Shapes/SvgRectangle.cs

@@ -28,6 +28,8 @@ namespace Svg
             _height = new SvgUnit(0.0f);
             _cornerRadiusX = new SvgUnit(0.0f);
             _cornerRadiusY = new SvgUnit(0.0f);
+            _x = new SvgUnit(0.0f);
+            _y = new SvgUnit(0.0f);
         }
 
         /// <summary>

Source/Properties/AssemblyInfo.cs

@@ -31,5 +31,5 @@ using System.Runtime.InteropServices;
 //
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("0.5.2.*")]
-[assembly: AssemblyFileVersion("0.5.2.0")]
+[assembly: AssemblyVersion("1.0.1.*")]
+[assembly: AssemblyFileVersion("1.0.1.*")]