Bump test projects up to .NET 4.5.2

- aspnet/Testing#248
- xUnit no longer supports .NET 4.5.1
- build tests for desktop .NET only on Windows

Also fix line endings in one src project. Otherwise unable to update repo.

Author: dougbu

src/Microsoft.Extensions.Options/Microsoft.Extensions.Options.csproj

@@ -1,19 +1,19 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <Import Project="..\..\build\common.props" />
-
-  <PropertyGroup>
-    <Description>Provides a strongly typed way of specifying and accessing settings using dependency injection.</Description>
-    <TargetFramework>netstandard1.0</TargetFramework>
-    <NoWarn>$(NoWarn);CS1591</NoWarn>
-    <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <PackageTags>aspnetcore;options</PackageTags>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="1.2.0-*" />
-    <PackageReference Include="Microsoft.Extensions.Primitives" Version="1.2.0-*" />
-    <PackageReference Include="System.ComponentModel" Version="4.4.0-*" />
-  </ItemGroup>
-
-</Project>
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <Import Project="..\..\build\common.props" />
+
+  <PropertyGroup>
+    <Description>Provides a strongly typed way of specifying and accessing settings using dependency injection.</Description>
+    <TargetFramework>netstandard1.0</TargetFramework>
+    <NoWarn>$(NoWarn);CS1591</NoWarn>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <PackageTags>aspnetcore;options</PackageTags>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="1.2.0-*" />
+    <PackageReference Include="Microsoft.Extensions.Primitives" Version="1.2.0-*" />
+    <PackageReference Include="System.ComponentModel" Version="4.4.0-*" />
+  </ItemGroup>
+
+</Project>

test/Microsoft.Extensions.Options.Test/Microsoft.Extensions.Options.Test.csproj

@@ -3,7 +3,8 @@
   <Import Project="..\..\build\common.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp1.1;net451</TargetFrameworks>
+    <TargetFrameworks>netcoreapp1.1;net452</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netcoreapp1.1</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>