Implement continous integration

We should have a minimum set of continious integration.
As a first step I implemented some build scripts based on fake.
Currently the build does:
* Install dependencies for the build with paket
* Install nuget dependenices of the Solution
* Get the version with GitVersion and path AssemblyInfo
* Build

** This PR is not yet finished**, but I allready created it, so that you know I am working on it.

I have to implement an AppVeyor.yml file and test it. Also the creation of a NuGet package must be automated yet.