Don Yu b9d1902262 add maximumValue and minimumValue as valid attributes for native Slider
Summary:
Noticed that the minimumValue and maximumValue for the SliderIOS component isn't actually picked up by the native slider that gets rendered. Issue #442

Closes https://github.com/facebook/react-native/pull/583
Github Author: Don Yu <donyu8@gmail.com>

Test Plan:
 Add minimumValue and maximumValue prop to <SliderIOS> component in SliderIOSExample.js for UIExplorer (see screenshots)

![sliderios_maximumvalue](https://cloud.githubusercontent.com/assets/1103836/6946764/9ebe8db8-d870-11e4-84e5-7c31a955f9c0.png)
![sliderios_minimumvalue](https://cloud.githubusercontent.com/assets/1103836/6946765/9ec0031e-d870-11e4-8a1b-2371a5aa033a.png)
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