More build fixes for the Aliases project.

Rx.NET/Source/Playground/Playground.csproj

@@ -48,6 +48,10 @@
       <Project>{63252AE9-5186-45CA-BFCD-FA51C6B66A43}</Project>
       <Name>System.Reactive.Linq</Name>
     </ProjectReference>
+    <ProjectReference Include="..\System.Reactive.Observable.Aliases\System.Reactive.Observable.Aliases.csproj">
+      <Project>{9ffac385-10a4-4ddd-b800-de67e8469cc0}</Project>
+      <Name>System.Reactive.Observable.Aliases</Name>
+    </ProjectReference>
     <ProjectReference Include="..\System.Reactive.PlatformServices\System.Reactive.PlatformServices.csproj">
       <Project>{0cccf009-763f-40d2-8655-7a94828023bf}</Project>
       <Name>System.Reactive.PlatformServices</Name>

Rx.NET/Source/Rx.sln

@@ -689,7 +689,8 @@ Global
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.DebugWP7|Any CPU.Build.0 = DebugWP7|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.DebugWP8|Any CPU.ActiveCfg = DebugWP8|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.DebugWP8|Any CPU.Build.0 = DebugWP8|Any CPU
-		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release35|Any CPU.ActiveCfg = Release40|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release35|Any CPU.ActiveCfg = Release35|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release35|Any CPU.Build.0 = Release35|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release40|Any CPU.ActiveCfg = Release40|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release40|Any CPU.Build.0 = Release40|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release45|Any CPU.ActiveCfg = Release45|Any CPU
@@ -697,13 +698,21 @@ Global
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release46|Any CPU.ActiveCfg = Release46|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release46|Any CPU.Build.0 = Release46|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release8|Any CPU.ActiveCfg = Release8|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release8|Any CPU.Build.0 = Release8|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release81|Any CPU.ActiveCfg = Release81|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.Release81|Any CPU.Build.0 = Release81|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleasePL|Any CPU.ActiveCfg = ReleasePL|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleasePL|Any CPU.Build.0 = ReleasePL|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleasePLLITE|Any CPU.ActiveCfg = ReleasePLLITE|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleasePLLITE|Any CPU.Build.0 = ReleasePLLITE|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseSL4|Any CPU.ActiveCfg = ReleaseSL4|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseSL4|Any CPU.Build.0 = ReleaseSL4|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseSL5|Any CPU.ActiveCfg = ReleaseSL5|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseSL5|Any CPU.Build.0 = ReleaseSL5|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseWP7|Any CPU.ActiveCfg = ReleaseWP7|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseWP7|Any CPU.Build.0 = ReleaseWP7|Any CPU
 		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseWP8|Any CPU.ActiveCfg = ReleaseWP8|Any CPU
+		{9FFAC385-10A4-4DDD-B800-DE67E8469CC0}.ReleaseWP8|Any CPU.Build.0 = ReleaseWP8|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE