Move files around, optimize references

Burr.Tests/Burr.Tests.csproj

@@ -35,11 +35,9 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Xml" />
+    <Reference Include="System.XML" />
+    <Reference Include="System.Xml.Linq" />
     <Reference Include="xunit">
       <HintPath>..\packages\xunit.1.9.0.1566\lib\xunit.dll</HintPath>
     </Reference>
@@ -51,7 +49,7 @@
     <Compile Include="GitHubClientTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Readme.cs" />
-    <Compile Include="StringExtensionsTests.cs" />
+    <Compile Include="Helpers\StringExtensionsTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Burr\Burr.csproj">

Burr/AuthenticationType.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Burr
+{
+    public enum AuthenticationType
+    {
+        Anonymous,
+        Basic,
+        Oauth
+    }
+}

Burr/Burr.csproj

@@ -32,16 +32,13 @@
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Core" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="GitHubClient.cs" />
+    <Compile Include="AuthenticationType.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="StringExtensions.cs" />
+    <Compile Include="Helpers\StringExtensions.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 

Burr/GitHubClient.cs

@@ -6,13 +6,6 @@ using System.Threading.Tasks;
 
 namespace Burr
 {
-    public enum AuthenticationType
-    {
-        Anonymous,
-        Basic,
-        Oauth
-    }
-
     public class GitHubClient
     {
         public GitHubClient()