OptionalParametersFilter - checks for methods with only optional parameters/no paremeters
Failing test -  ClassMethods cannot extract from getters with optional params
Allowing ClassMethods to also call methods with optional parameters

Fixes test @b47c85e045b185cec8fd6b95b6db2d3d4ddf2a5c
Update RoleInterface.php

RoleInterface should extend RecursiveIterator!
Update StrategyInterface.php

This PR is to implement functionality as detailed in the AbstractHydrator. This should *not* be a BC break.

https://github.com/zendframework/zf2/blob/master/library/Zend/Stdlib/Hydrator/AbstractHydrator.php#L114
https://github.com/zendframework/zf2/blob/master/library/Zend/Stdlib/Hydrator/AbstractHydrator.php#L131
Update StrategyInterface.php
Update StrategyInterface.php

Added todo for version 3.0.
Caching analyzed methods map for performance
Test for OptionalParametersFilter caching functionality
Merge pull request #4539 from spiffyjr/patch-2

Update StrategyInterface.php
Merge branch 'hotfix/4539'

Close #4539
Use the keys of the collectionData to filter against since they don't have to be consecutive
Merge branch 'hotfix/4516'

Close #4516
Merge pull request #4535 from spiffyjr/patch-1

Update RoleInterface.php
Merge branch 'hotfix/4535'

Close #4535
Merge pull request #4496 from Ocramius/hotfix/class-methods-hydrator-optional-parameters

Class methods hydrator skips getters with optional parameters
Merge branch 'hotfix/4496'

Close #4496