- Fixed UITabBar use tintColor for selected item title
- Fixed UITabBarItem use original unselected for unselected item
- Using [[UI7PickView appearance] backgroundColor] when is not nil, to set up the UI7PickLikeView backgroundView
- Only set the UI7PickLikeView backgroundView frame once when initialize
- Use -[[UI7NavigationBar appearance] backgroundColor] if not nil
- Using search bar placeholder if not nil
- Reverse the pod spec as the author ask
Merge pull request #154 from xmkevinchen/to_merge

Some update for UI7TabBar, UI7PickerView, UI7NavigationBar, UI7SearchBar