Updated Serilog & EF
SA fixes
Small improvements to the build scripts

Fully documented the PSake script file. It is now  possible to specify
the MSBuild verbosity level from the command line.  In
Make.Foundations.proj, added the ability to select a subset of the list
of projects to build. Using a MSBuild response file, allowed to try out
the build system without actually committing your personal MSBuild
parameters.
Upgraded NSubstitute to version 1.8.1
Only display MSBuild warnings for local overloads when meaningful
Bugfix: Enable white-box tests when internals are visible