Add stepsToChoosePhotoInLibrary

stepsToChoosePhotoInLibrary is basically the same thing as stepsToChoosePhotoInAlbum, but a photo library picker doesn't have the 'Choose Photo' and 'Choose' buttons and is dismissed automatically after tapping a photo. This method avoids trying to tap those buttons.

I had to create this out of the need to interface with the photo library picker that is presented when the iOS simulator is given a UIImagePickerController and the camera is the source.