Martin Konicek 52ddfd9b51 Bugfix: Make iOS Slider it the responder
Summary:This fixes issues with other view (like the Navigator) stealing the responder and becoming interactive while the user is dragging the slider.

From [documentation](https://facebook.github.io/react-native/docs/gesture-responder-system.html):
- `onStartShouldSetResponder`: Does this view want to become responder on the start of a touch? -> Yes.
- `onResponderTerminationRequest`: Something else wants to become responder. Should this view release the responder? -> No.

Reviewed By: ericvicenti

Differential Revision: D3133337

fb-gh-sync-id: 3d7e1e6a2ed6fa605857cfb0549ffa71df85fd22
fbshipit-source-id: 3d7e1e6a2ed6fa605857cfb0549ffa71df85fd22
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