#34 Add Web.Additionator to Femah.Examples Github repo

This got a little involved, trust NuGet to get in the way, the
highlights:
- A new Femah.Examples solution structure, introducing the \Web solution
folder
- Removed existing test web app
- Ported Additionator (core, core.tests and web projects) across (need
to sort out some namespace overhang from it being someapplication as we
go along)
- Introduced Femah.Core as a NuGet package reference
- Everything is .NET 4.5, we need to attack this once Femah.Core is
bumped down to a lower framework dependency.
- Really put the cat amongst the pigeons and have untracked all packages
from the solution level \packages folder and added an exclusion to
.gitignore