Several improvements

• Improved tap to dismiss
• Moved private stuff into separate header
• Improved customizablility for ALAertBannerStyle
• Removed experimental iSO 4.3 support (-[UIColor darkerColor] requires
iOS 5)
• General improvements and fixes
Updated sample project
cleaned up the cleanup
removed makeStyle functionality

I don't think it's ready for primetime. I'd like to think of a better
way to integrate it to keep the consistency between it and the other
properties.
removed spaces