`-setup` called twice after `-init`

`-initWithFrame:` method is Designated Initializer for UIView. UILabel, UITextView, UITextField are classes inheriting from UIView, so after code

```
[[SSDynamicLabel alloc] init];
```

first will be called method `-init` then `-initWithFrame:`, so method `-setup` is called twice.
To fix this, just remove `-init` override from all UIView inheriting classes.
