2.1.0

This release include the following features:

1. Support custom repository, and can using UnitOfWork.GetRepository<TEntity>() to retrieve the custom repository;
2. Using TransactionScope to support distributed transaction

v2.0.1

1. impls the entity projection, this has some breaking changing for GetPagedList
   GetPagedList(x => x.Id > 10) MUST be changed to GetPagedList(predicate: x => x.Id > 10)
2. load the FirstOrDefault entity with related entities.