Add migration notes about Pk deprecation (update related code samples)
Stop ClosableLazy throwing NPE when close called before get

Fixes #3024.
Merge pull request #3029 from cchantep/anorm-pkbk

Anorm Pk deprecation
Merge pull request #3030 from richdougherty/lazy-closable-npe

Stop ClosableLazy throwing NPE when close called before get