Removed XNA project type from the Spine XNA and XNA example projects.

This allows these projects to be opened in Visual studio 2012.

spine-xna/example/spine-xna-example.csproj

@@ -2,7 +2,7 @@
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <ProjectGuid>{29CC4385-294A-4885-A3E8-FD4825E0CFDD}</ProjectGuid>
-    <ProjectTypeGuids>{6D335F3A-9D43-41b4-9D22-F6F17C4BE596};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <ProjectTypeGuids>{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
     <OutputType>WinExe</OutputType>

spine-xna/spine-xna.csproj

@@ -2,7 +2,7 @@
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <ProjectGuid>{7F8F2327-C016-49C8-BB4D-F3F77971961E}</ProjectGuid>
-    <ProjectTypeGuids>{6D335F3A-9D43-41b4-9D22-F6F17C4BE596};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <ProjectTypeGuids>{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
     <OutputType>Library</OutputType>