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Added ability to customize title for Done button.
Sample usage in CTUITweaksViewController, and CTCustomDoneButtonViewController (new sample controller, added to Appearance section).
This adds public interface (doneButtonTitle property), but in backwards-compatible way, so the version for CocoaPod might need to be incremented to 3.1.0. That is, if you choose to merge it - but please do. The obvious use case is, e.g. we use the picker to choose the images to be uploaded to a server, so we want this button to say "Upload" rather than "Done".