Scan an assembly in order to create a DataContractContentSerializer

Resolves #100.
>Why is sut and actual named like that?

`sut` is the result produced by the `Scan` method and `actual` is the serialized XML produced by the `sut`.

IMHO it's not enough to assume that `sut` is just the result of `Scan`—We have to do some sort of verification, otherwise one can easily use the [Devil's Advocate technique](http://www.pluralsight.com/courses/outside-in-tdd) inside the `Scan` method...