iphone_4in? now reports true for iPhone 5S

## motivation

`Device::iphone_5?` was returning `false` for the iPhone 5S.  Issue https://github.com/calabash/calabash-ios/issues/319

Replaces `Device::iphone_5?` with `Device::iphone_4in?`.

`Device::iphone_5?` and `Calabash::Cucumber::EnvironmentHelpers::iphone_5?` have been deprecated.

## tests

## Testing

* [briar 0.1.4.b1](https://github.com/jmoody/briar/tree/0.1.4.b1)
* [briar-ios-example master](https://github.com/jmoody/briar-ios-example)

### Briar

* tags 
    - @issue_319

* ruby versions 
   - [x] ruby 2.0
   - [x] ruby 1.9
   - [x] ruby 1.8 
    
* test on local sims and devices

#### XTC @issue_319

```
Apple iPad 2 (6.1.3)
Apple iPad 4th Gen (7.0.4)
Apple iPad Air (7.0.4)
Apple iPad Mini (6.1.3)
Apple iPad Mini (7.0.4)
Apple iPad Mini Retina (7.0.4)
Apple iPhone 4S (6.1.3)
Apple iPhone 4S (7.0.4)
Apple iPhone 4S (5.1.1)
Apple iPhone 5 (6.1.4)
Apple iPhone 5 (7.0.4)
Apple iPhone 5S (7.0.4)
Apple iPod touch 5th Gen (6.0.1)
Apple iPod touch 5th Gen (7.0.4)
Apple iPod touch 5th Gen (6.1.3)
```