Scan an assembly in order to create a DataContractContentSerializer

Resolves #100.
I think your [suggested verification](https://github.com/GreanTech/AtomEventStore/pull/102/files#r19732669) is fine - I just don't find the variable names or the white space helpful.

What's the System Under Test?

Hint: there's a reason it's called *System* Under Test, and not Object Under Test. Just like *unit* doesn't mean *object*.