Removed packages from .gitignore,

enabling check-in of NuGet packages
(http://blog.ploeh.dk/2014/02/03/using-nuget-with-autonomous-repositories).
Added an empty Visual Studio project.
Added xunit NuGet package,

since Exude is going to be an extension to xUnit.net.
Added a unit test project.
Added xunit NuGet package to unit tests.
Introduced FirstClassCommand,

which will be the command that implements first-class, programmatic tests.
The reason for adding this test now is mainly to have a single test, so
that the rest of the setup can be completed, including build scripts, etc.

However, the test is correct.
Added xunit.runners NuGet package,

for build script purposes.
Added NuGet.CommandLine NuGet package,

for build script purposes.
Added XML documentation file output for Release

builds.
Added a NuGet specification file for a potential

Exude NuGet package.
Added NuGetPackages directory to .gitignore.
Added automated build script files.