Summary:
`value` is clamped between min/max and so order of prop application matters - `value` always ended up being set first in my tests, and consequently a value outside of the default range 0-1 would not work. So this applies the value when the min/max are set.
[Gist of broken example](https://gist.github.com/brentvatne/fc637b3e21d012966f3a)
^ the second slider here should have it's cursor in the middle
/cc @tadeuzagallo
Closes https://github.com/facebook/react-native/pull/835
Github Author: Brent Vatne <brent.vatne@madriska.com>
Test Plan: Imported from GitHub, without a `Test Plan:` line.
5fb5148e3d
