timob-13686: added support for selectedBackgroundColor and selectedBackgroundImage
timob-13686: added documentation
Merge branch 'master' of git://github.com/appcelerator/titanium_mobile into timob-13686-v2
Merge pull request #4783 from hieupham007/timob-13686-v2

Timob 13686 v2: added supported for selectedBackgroundColor and selectedBackgroundImage