Adding in Callback for #3371
Fixed prepared statement params
Removed callable type hint since this is PHP 5.4 only
Throw an exception if an invalid callback is provided
DocBlock fixes
Refactored #3490. Split DbTable into 2 different (CallbackCheck and CredentialTreatment) adapters
Removed '_' prefixes from non public API function names
Merge pull request #3490 from youngguns-nl/zf-3371

Added support for callable credential validator

Conflicts:
	library/Zend/Authentication/Adapter/DbTable.php