Added capability for additional text fields to be added to AlertViews #69
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Fixes #68: Added code to be able to handle multiple textfields in an alertview
simply by passing in placeholders for the desired textfields.
Placeholders should be blank (@"") if no placeholder is required.
An outlet has also been provided to be able to access the value in the
textfields from the block for the Done button.
There were a number of left over methods after these changes which I
could not see a use for, so I have removed them to avoid clutter /
unneccesary complexity