[dotNetRDF-Develop] Dependency Refactoring

[Rob V. <rv...@do...>]

Hey All

I've just completed a refactoring of how we manage dependencies in the
project.  All external dependencies are now obtained via NuGet and there is
no longer a Dependencies folder checked into source control.

I've also changed how we do the alternative builds of the libraries so the
main solution now has projects included to build the libraries for all
supported platforms.  The alternative builds get synced up with the main
build by a pre-build event so when you add/remove something to/from the main
build on the next compile of the alternative builds the change(s) will be
automatically pulled in for you (though VS will make you reload the
project).

Note this does however mean that you will now need to have Silverlight 4
Tools for VS and Windows Phone 7.1 Tools for VS installed to build the
solution correctly.

Hopefully this makes building things much easier for people since all the
libraries can now be built directly from Visual Studio

Rob