Update our compiler and diagnostics toolset to the latest signed build

Also disable a unit test that fails with new toolset.

src/.nuget/packages.config

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c) Microsoft Open Technologies, Inc.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 <packages>
-  <package id="Microsoft.Net.ToolsetCompilers" version="1.0.0-rc2-20150413-02" targetFramework="net45" />
-  <package id="Microsoft.Net.RoslynDiagnostics" version="1.0.0-rc2-20150413-02" targetFramework="net45" />
+  <package id="Microsoft.Net.ToolsetCompilers" version="1.0.0-rc2-20150415-05" targetFramework="net45" />
+  <package id="Microsoft.Net.RoslynDiagnostics" version="1.0.0-rc2-20150415-05" targetFramework="net45" />
   <package id="FakeSign" version="0.9.2" targetFramework="net45" />
 </packages>

src/EditorFeatures/VisualBasicTest/Completion/CompletionProviders/SymbolCompletionProviderTests.vb

@@ -5078,7 +5078,8 @@ Class C
         End Sub
 
         <WorkItem(909121)>
-        <Fact, Trait(Traits.Feature, Traits.Features.Completion)>
+        <WorkItem(2048, "https://github.com/dotnet/roslyn/issues/2048")>
+        <Fact(Skip:="2048"), Trait(Traits.Feature, Traits.Features.Completion)>
         Public Sub CommitGenericOnParen()
             Dim text =
 <code>

src/Tools/Microsoft.CodeAnalysis.Toolset.Open/Targets/VSL.Settings.targets

@@ -54,8 +54,8 @@
   <!-- Import the global NuGet packages -->
   <PropertyGroup>
     <ToolsetCompilerPackageName>Microsoft.Net.ToolsetCompilers</ToolsetCompilerPackageName>
-    <ToolsetCompilerPropsFilePath>$(NuGetPackagesPath)\Microsoft.Net.ToolsetCompilers.1.0.0-rc2-20150413-02\build\Microsoft.Net.ToolsetCompilers.props</ToolsetCompilerPropsFilePath>
-    <RoslynDiagnosticsPropsFilePath>$(NuGetPackagesPath)\Microsoft.Net.RoslynDiagnostics.1.0.0-rc2-20150413-02\build\Microsoft.Net.RoslynDiagnostics.props</RoslynDiagnosticsPropsFilePath>
+    <ToolsetCompilerPropsFilePath>$(NuGetPackagesPath)\Microsoft.Net.ToolsetCompilers.1.0.0-rc2-20150415-05\build\Microsoft.Net.ToolsetCompilers.props</ToolsetCompilerPropsFilePath>
+    <RoslynDiagnosticsPropsFilePath>$(NuGetPackagesPath)\Microsoft.Net.RoslynDiagnostics.1.0.0-rc2-20150415-05\build\Microsoft.Net.RoslynDiagnostics.props</RoslynDiagnosticsPropsFilePath>
     <AdditionalFileItemNames>$(AdditionalFileItemNames);PublicAPI</AdditionalFileItemNames>
   </PropertyGroup>