Inconsistency between `types` and `propTypes`

In cases, when `PropTypes.oneOf` is used, the `type` specifies only a single type.
```
Component.propTypes = {
  title: React.PropTypes.oneOfType([
      React.PropTypes.string,
      React.PropTypes.element
  ])
}
```
```
Component.types = {
  title: TYPES.STRING
}
```