Allow changing done and cancel button titles

[omar-qdimensions]

I added the ability to change the done and cancel button titles, for cases when someone needs to have a multilingual application. I also updated one of the samples to demonstrate usage (but it's commented out).

[skywinder]

Thank you.
Is this the same as #87 ?

[ma2kubo]

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[skywinder]

After some research, I decided not to add this pull request.

The #87 is more generic. And it will be added soon.

To add Cancel button you can use method:

- (void)addCustomButtonWithTitle:(NSString *)title value:(id)value

[ma2kubo]

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Subject: Re: [ActionSheetPicker] Allow changing done and cancel button titles (#82)

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