[TIMOB-8375] iOS: OptionDialog appearance

I was reading the OptionDialog APIDoc and I doesn't found any references to change the style of the OptionDialog using Titanium API. OptionDialog API: http://developer.appcelerator.com/apidoc/mobile/latest/Titanium.UI.OptionDialog-object In the native iOS, you can set the style of ActionSheetStyle. UIActionSheet Class Reference: https://developer.apple.com/library/ios/#documentation/uikit/reference/UIActionSheet_Class/Reference/Reference.html