Updated StartPage submodule to build on VS2015.

GitHubVS.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.25824.0
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GitHub.VisualStudio", "src\GitHub.VisualStudio\GitHub.VisualStudio.csproj", "{11569514-5AE5-4B5B-92A2-F10B0967DE5F}"
 	ProjectSection(ProjectDependencies) = postProject

submodules/externalpackages/StartPage

@@ -1 +1 @@
-Subproject commit 69b045dfe437946d745d4ff504a2f47320de3b2f
+Subproject commit 1c37273f9a2a01de3e0f0227fe034bb4a0054776