Issue 471: Support Windows 8.1 applications

Src/GoogleApis.Windows/GoogleApis.Windows.csproj

Index: Src/GoogleApis.Windows/GoogleApis.Windows.csproj
===================================================================
rename from Src/GoogleApis.WinRT/GoogleApis.WinRT.csproj
rename to Src/GoogleApis.Windows/GoogleApis.Windows.csproj
--- a/Src/GoogleApis.WinRT/GoogleApis.WinRT.csproj
 b/Src/GoogleApis.Windows/GoogleApis.Windows.csproj
@@ -1,5 1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
 <PropertyGroup>
 <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -16,6 16,9 @@
 <ProjectTypeGuids>{BC8A1FFA-BEE3-4634-8014-F334798102B3};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
 <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
 <RestorePackages>true</RestorePackages>
 <TargetPlatformVersion>8.1</TargetPlatformVersion>
 <MinimumVisualStudioVersion>12</MinimumVisualStudioVersion>
 <TargetFrameworkVersion />
 </PropertyGroup>
 <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
 <DebugSymbols>true</DebugSymbols>
@@ -142,8 145,8 @@
 <HintPath>..\..\packages\Microsoft.Net.Http.2.2.22\lib\win8\System.Net.Http.Primitives.dll</HintPath>
 </Reference>
 </ItemGroup>
- <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '11.0' ">
- <VisualStudioVersion>11.0</VisualStudioVersion>
 <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '12.0' ">
 <VisualStudioVersion>12.0</VisualStudioVersion>
 </PropertyGroup>
 <Import Project="$(MSBuildExtensionsPath)\Microsoft\WindowsXaml\v$(VisualStudioVersion)\Microsoft.Windows.UI.Xaml.CSharp.targets" />
 <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />