Added shouldDismissPresentedViewController property to options

[tspecht]

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I recently had the need to stack multiple modal navigation controller in my app. Therefore I added a shouldDismissPresentedViewController property to the options to enable this functionality in my app. Maybe someone else finds that functionality useful :)

[clayallsopp]

I think this would be useful! if we keep backwards compatibility. I am wary of adding a bunch of options, but I think it's okay for now

can we add a test for this?

[tspecht]

@clayallsopp thanks for taking a look so fast, I just fixed the typos, added the method back in for backwards compatibility and fixed the indentation. Please also see my other comment.

[clayallsopp]

awesome! can you add tests? the existing ones should point you in the right direction