Fix build for mac

src/UnityExtension/Assets/Editor/GitHub.Unity/GitHub.Unity.csproj

@@ -11,7 +11,7 @@
     <AssemblyName>GitHub.Unity</AssemblyName>
     <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
-    <OutputPath>$(SolutionDir)unity\TestProject\Assets\Editor\</OutputPath>
+    <OutputPath>$(SolutionDir)\unity\TestProject\Assets\Editor\</OutputPath>
     <IntermediateOutputPath>..\obj\</IntermediateOutputPath>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">

src/packaging/CopyLibrariesToDevelopmentFolder/CopyLibrariesToDevelopmentFolder.csproj

@@ -58,6 +58,7 @@
     <Folder Include="Properties\" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Target Name="CoreCompile" />
   <!-- 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">