JSON.Reads / Writes for java.util.UUID

Basic implementation only uses UUID.fromString and can accept invalid UUIDs.
Optionally rejects incorrect uuids which are still accepted by UUID.fromString
Merge pull request #2428 from divarvel/master

Add: JSON serialization / Deserialization of java.util.UUID
Specification for date column
Merge pull request #2434 from cchantep/anorm-datecol-specs

Specifications for date column
Big integer parameter