[VS Addin] Add visual studio 2012 support

visual_studio/NativeClientVSAddIn/UnitTests/UnitTests.csproj

Index: visual_studio/NativeClientVSAddIn/UnitTests/UnitTests.csproj
diff --git a/visual_studio/NativeClientVSAddIn/UnitTests/UnitTests.csproj b/visual_studio/NativeClientVSAddIn/UnitTests/UnitTests.csproj
index eae16ef5868eee001692108b3ae3e776c42269cb..32d746e0028175be36523e87148e5461d013cae8 100644
--- a/visual_studio/NativeClientVSAddIn/UnitTests/UnitTests.csproj
+++ b/visual_studio/NativeClientVSAddIn/UnitTests/UnitTests.csproj
@@ -19,7 +19,7 @@
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
-    <OutputPath>..\..\..\out\vs_addin\Debug\</OutputPath>
+    <OutputPath>..\..\..\out\vs_addin\2010\Debug\</OutputPath>
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
@@ -27,7 +27,7 @@
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
-    <OutputPath>..\..\..\out\vs_addin\Release\</OutputPath>
+    <OutputPath>..\..\..\out\vs_addin\2010\Release\</OutputPath>
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>