Some small changes

- Rename files in examples
- Fix spelling error in RoutingSpec
- Props should, when failing to create actors, have better error message
- Include full exception when logging errors. Useful information was missing, such as inner exception info.
- Add ActorPath: Root, Parent, == and != operators. 
- Make Elements an IReadOnlyCollection. Making Elements an IReadOnlyCollection makes checking for empty paths so much easier.
- Make Address IEquatable<Address> and add equality operators
- Add Base64 Encoding helper