NuGet.Server to persist hashes of NuGet packages on the filesystem.
This decreases the worker processes' response time on first request.
cr: feiling;lukez
Remove reference to elmah in server
Enable BuildPackages task on all builds.
Update prerelease tag in build.proj to be consistent with values in CommonAssemblyInfo.cs.
Change target framework to 4.5 from 4.5.1 for dev12 and later and fix server package creation.
Merge branch 'dev-3.0.0'

Conflicts:
	Build/Build.proj
Pass includePrerelease flag to ActionResolver in UI.
Added expander to show the stack trace in infinite scroll list.
Fixed some FxCop issues
Merge branch 'dev-3.0.0' of https://git01.codeplex.com/NuGet into dev-3.0.0
Remove NuGet.Data submodule
Removed package restore from Build.proj (we'll do it in a separate build step)