Issue 351: Reimplement OAuth2 - Step 2 (Auth PCL - only data types)

Src/GoogleApis.Auth/GoogleApis.Auth.csproj

Index: Src/GoogleApis.Auth/GoogleApis.Auth.csproj
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new file mode 100644
--- /dev/null
 b/Src/GoogleApis.Auth/GoogleApis.Auth.csproj
@@ -0,0 1,119 @@
 <?xml version="1.0" encoding="utf-8"?>
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 <ErrorReport>prompt</ErrorReport>
 <WarningLevel>4</WarningLevel>
 <DocumentationFile>Google.Apis.Auth.xml</DocumentationFile>
 </PropertyGroup>
 <ItemGroup>
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 <Compile Include="JsonWebToken.cs" />
 <Compile Include="OAuth2\AuthorizationCodeWebApp.cs" />
 <Compile Include="GoogleJsonWebSignature.cs" />
 <Compile Include="OAuth2\IAuthorizationCodeFlow.cs" />
 <Compile Include="OAuth2\AuthorizationCodeInstalledApp.cs" />
 <Compile Include="OAuth2\BearerToken.cs" />
 <Compile Include="OAuth2\Credential.cs" />
 <Compile Include="OAuth2\AuthorizationCodeFlow.cs" />
 <Compile Include="OAuth2\ClientSecrets.cs" />
 <Compile Include="OAuth2\GoogleAuthorizationCodeFlow.cs" />
 <Compile Include="OAuth2\IAccessMethod.cs" />
 <Compile Include="OAuth2\IAuthorizationCodeInstalledApp.cs" />
 <Compile Include="OAuth2\ICodeReceiver.cs" />
 <Compile Include="OAuth2\Requests\AuthorizationCodeRequestUrl.cs" />
 <Compile Include="OAuth2\Requests\AuthorizationCodeTokenRequest.cs" />
 <Compile Include="OAuth2\Requests\GoogleAssertionTokenRequest.cs" />
 <Compile Include="OAuth2\Requests\GoogleAuthorizationCodeRequestUrl.cs" />
 <Compile Include="OAuth2\Responses\AuthorizationCodeResponseUrl.cs" />
 <Compile Include="OAuth2\Requests\AuthorizationRequestUrl.cs" />
 <Compile Include="OAuth2\GoogleClientSecrets.cs" />
 <Compile Include="OAuth2\GoogleConsts.cs" />
 <Compile Include="OAuth2\Requests\RefreshTokenRequest.cs" />
 <Compile Include="OAuth2\Responses\TokenErrorResponse.cs" />
 <Compile Include="OAuth2\Requests\TokenRequest.cs" />
 <Compile Include="OAuth2\Responses\TokenResponse.cs" />
 <Compile Include="OAuth2\Responses\TokenResponseException.cs" />
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 <Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.10\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
 <Error Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.10\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
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 <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
 Other similar extension points exist, see Microsoft.Common.targets.
 <Target Name="BeforeBuild">
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 <Target Name="AfterBuild">
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 </Project>