Add support to others ui components

[glaucocustodio]

Hi, here in my work, we started using this library, and then, we added support for some inputs beyond than just UITextField, like: UITextView, UISegmentedControl and UIStepper:

public var textFieldErrors:[UITextField:ValidationError] = [:]
public var textViewErrors:[UITextView:ValidationError] = [:]
public var segmentedControlErrors:[UISegmentedControl:ValidationError] = [:]
public var stepperErrors:[UIStepper:ValidationError] = [:]

public var textFieldValidations:[UITextField:ValidationRule] = [:]
public var textViewValidations:[UITextView:ValidationRule] = [:]
public var segmentedControlValidations:[UISegmentedControl:ValidationRule] = [:]
public var stepperValidations:[UIStepper:ValidationRule] = [:]
...

Now we are moving to iOS 9 and would like to get the latest SwiftValidator and merge what we have done so far.

My question is: a PR with these changes would be welcome?

Thanks.

[jpotts18]

I would be interested in seeing these different inputs in SwiftValidator.

[glaucocustodio]

Please, check #73.

[ryan-blunden]

I've checked #73 and the added support for UITextView is essential for a project I'm working on.

[jpotts18]

I believe this functionality has been added in #118