Fix for issue #222

Changed to use correct dimensions in declarations of properties.

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/Vector2ShaderProperty.cs

             get { return new Vector4(value.x, value.y, 0, 0); }
         }
        
+        public override string GetPropertyDeclarationString(string delimiter = ";")
+        {
+            return string.Format("float2 {0}{1}", referenceName, delimiter);
+        }
 
         public override PreviewProperty GetPreviewMaterialProperty()
         {

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/Vector3ShaderProperty.cs

             get { return new Vector4(value.x, value.y, value.z, 0); }
         }
         
+        public override string GetPropertyDeclarationString(string delimiter = ";")
+        {
+            return string.Format("float3 {0}{1}", referenceName, delimiter);
+        }
+
         public override PreviewProperty GetPreviewMaterialProperty()
         {
             return new PreviewProperty(PropertyType.Vector3)

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/Vector4ShaderProperty.cs

             get { return value; }
         }
 
+        public override string GetPropertyDeclarationString(string delimiter = ";")
+        {
+            return string.Format("float4 {0}{1}", referenceName, delimiter);
+        }
+
         public override PreviewProperty GetPreviewMaterialProperty()
         {
             return new PreviewProperty(PropertyType.Vector4)

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/VectorShaderProperty.cs

             result.Append(")");
             return result.ToString();
         }
-
-        public override string GetPropertyDeclarationString(string delimiter = ";")
-        {
-            return string.Format("float4 {0}{1}", referenceName, delimiter);
-        }
     }
 }