Summary:
Fixes#534:

```jsx
<SegmentedControlIOS
tintColor="#ff0000"
values={['One', 'Two', 'Three', 'Four']}
selectedtIndex={0}
momentary={false}
enabled={true}
onValueChange={ (value) => console.log(value) } />
```
This only supports string-based segments, not images. Also doesn't support full customization (no separator images etc); I figure this is a good MVP to lock-down a basic API
I also included a snapshot test case, but the images keep coming out funky. When I look at the sim, I see that the text labels show up for the selected segment, but the snapshot keeps coming out with no text on those segments. I tried forcing a delay, but same result. Is that explainable?
Obviously happy to change anything about the API, code-style nitpicks, etc
Closes https://github.com/facebook/react-native/pull/564
Github Author: Clay Allsopp <clay.allsopp@gmail.com>
Test Plan: Imported from GitHub, without a `Test Plan:` line.
Summary:
@nicklockwood - Could I get a review of this?
Just took `RCTTextField` and ported it from `UITextField` to `UITextView` as you mentioned in another discussion, and removed any `UITextField` specific attributes.
- How do you think this should behave when there are subviews?
- Do you know how we can respond to the `UIControlEventEditingDidEndOnExit` event to respond to submit? Because `UITextView` isn't a `UIControl` we can't just use `addTarget` with `UIControlEventEditingDidEndOnExit`.
- Any other feedback?
Still going to look over the `UITextView` docs in more detail and make sure we expose all important options, and add it to the UIExplorer example, just putting this out here for feedback.

Closes https://github.com/facebook/react-native/pull/991
Github Author: Brent Vatne <brent.vatne@madriska.com>
Test Plan: Imported from GitHub, without a `Test Plan:` line.
Summary:
It is very rare, but sometimes there is no active gesture when the responder gets released. This will avoid a redbox in that case
@public
Test Plan: Saw the redbox. No longer see the redbox. Hardcoded missing activeGesture while responder and verified no redbox