Update build tools reference to 1.0.11. This version of the build

tools has been formatted, and has changes to work with our latest CI
project on Visual Studio Online.

Author: Matt Cohn

build.proj

@@ -2,7 +2,7 @@
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
   <PropertyGroup>
-    <BuildToolsVersion>1.0.10-prerelease</BuildToolsVersion>
+    <BuildToolsVersion>1.0.11-prerelease</BuildToolsVersion>
   </PropertyGroup>
 
   <PropertyGroup>