Preload assemblies during Glimpse Runtime startup
Handle error BuildManager.GetReferencedAssemblies

Unittests fail on the call to BuildManager.GetReferencedAssemblies,
since the BuildManager is supposed to run in the context of an ASP.NET
runtime. So a try catch has been added to logs succes or failure of the
called method.
Merge pull request #481 from Glimpse/PreloadAllAssembliesOnGlimpseRuntimeStartup

Preload assemblies during Glimpse Runtime startup