[TIMOB-16507] iOS: Change pullView default background color in listView, tableView

Introduces new property pullBackgroundColor on Ti.UI.View to change the background color of wrapper view for the pullView

Also introduces a new event noresults on the iOS platform when the search result is empty.

Test case is in [JIRA](https://jira.appcelerator.org/browse/TIMOB-16507)