Add php 7.1 type hints

[weierophinney]

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Originally posted by @snapshotpl at zendframework/zend-servicemanager#247

[weierophinney]

@snapshotpl this needs a rebase, sorry :-\

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Originally posted by @Ocramius at zendframework/zend-servicemanager#247 (comment)

[weierophinney]

@Ocramius done!

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Originally posted by @snapshotpl at zendframework/zend-servicemanager#247 (comment)

[GeeH]

I'm going to close this, part of my attention in working on this component is to add type hints and other general cleanup in one fell swoop. Thank you so much to @snapshotpl for this effort in the first place.