Specify correct return type for `Pdo\Connection::getLastGeneratedValue`

See http://php.net/manual/en/pdo.lastinsertid.php for reference that it returns `sting` instead of `int`.

TODO: change type of `$lastInsertValue` property and `getLastInsertValue` method in `Zend/Db/TableGateway/AbstractTableGateway.php` accordingly.
Update Predicate.php

I have added a notLike predicate in file so you can use is on sql query
Merge branch 'patch-1' of git://github.com/irnc/zf2 into hotfix/5508

* 'patch-1' of git://github.com/irnc/zf2:
  Specify correct return type for `Pdo\Connection::getLastGeneratedValue`
Closes #5508
Merge branch 'hotfix/5508'

* hotfix/5508:
  Specify correct return type for `Pdo\Connection::getLastGeneratedValue`
Merge pull request #5775 from mannecheema/patch-1

Update Predicate.php

* mannecheema/patch-1:
  Update Predicate.php
Added unit tests for Zend\Db\Sql's Predicate factory for notLike()
CS Fixes
Closes #5775
Merge branch 'hotfix/5775'

* hotfix/5775:
  Added unit tests for Zend\Db\Sql's Predicate factory for notLike() CS Fixes
  Update Predicate.php