Added typeparam documentation.
Added summary documentation.
Added documentation for IIdentifiable
Moved IIdentifiable into the Interfaces folder.
Added typeparam doco for IDomainContext.  Also standardized some of my comments to remove the period (.) at the end, like the existing documentation in the solution.
Started doco for IDomainRepository.
Merge pull request #56 from ericburcham/master

GetById Documentation.