Made backgroundColor property work properly.
Made backgroundColor property work properly.

CQXfly/DZNSegmentedControl,hjanuschka/DZNSegmentedControl,hoanganh6491/DZNSegmentedControl,jonesgithub/DZNSegmentedControl,hoanganh6491/DZNSegmentedControl,jonesgithub/DZNSegmentedControl,CQXfly/DZNSegmentedControl,xhacker/DZNSegmentedControl,smallmuou/DZNSegmentedControl,bellchen/DZNSegmentedControl,hjanuschka/DZNSegmentedControl,smallmuou/DZNSegmentedControl,perrystreetsoftware/DZNSegmentedControl,dzenbot/DZNSegmentedControl,hoanganh6491/DZNSegmentedControl,CQXfly/DZNSegmentedControl,gtranchedone/DZNSegmentedControl,jonesgithub/DZNSegmentedControl,gtranchedone/DZNSegmentedControl,sprylogics/DZNSegmentedControl,xhacker/DZNSegmentedControl,hjanuschka/DZNSegmentedControl,smallmuou/DZNSegmentedControl,xhacker/DZNSegmentedControl,gtranchedone/DZNSegmentedControl