Benoit VALLON ca2741609a Fix badgeColor for previous iOS 10 versions
Summary:
The actual badgeColor prop causes the following error when run on device with a version inferior to iOS 10 like iPad 2 and iPad mini 1.

`*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITabBarItem setBadgeColor:]: unrecognized selector sent to instance 0x7968be80'`

This PR fixes it by checking at runtime if the selector is available for the current running version.

It also makes the color available at start by using the variable `self.barItem`. Currently, the color appears only after a reload.
Closes https://github.com/facebook/react-native/pull/12354

Differential Revision: D4598036

Pulled By: shergin

fbshipit-source-id: 9f104fc27db51213a54273e33c5a22f1b350c55e
2017-02-22 12:04:10 -08:00
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