Added XmlContentSerializer.CreateTypeResolver. The purpose of this function is to scan an assembly and find all types annotated with [XmlRoot] attributes, and pull the associated local and namespace names out of them.
Added a Guard Clause, verifying that the assembly contains public types annotated with [XmlRoot] attribute.
Returned an ITypeResolver instance.
Documented XmlContentSerializer.CreateTypeResolver.
Incremented minor version,

in order to indicate that the addition of a conventience method to
generate an ITypeResolver based on attributes from the
System.Xml.Serialization namespace is a new feature; it resolves #93
(https://github.com/GreanTech/AtomEventStore/issues/93).