Separation of interfaces into own assembly

[abrasat]

Would be possible to separate the Mongo-independent interface declarations (IRepository, IEntity) into an own assembly (something like Repository.Core) ?
This would allow to use the MongoRepository in client-server scenarios, where the clients would reference just the interface assembly, without having to be aware of the "real" database implementation (Mongo in this case).

[RobThree]

I'll put that down for 2.0. I hope to get work started on that soon (see #4 )