[buck install] Support Xcode 7 Simulator.app
[buck install] Support Xcode 7 Simulator.app

Summary:
In Xcode 7 beta, `iOS Simulator.app` was renamed to `Simulator.app`.

This updates `buck install` for Apple platforms to check both locations.

Test Plan:
`ant java-test -Dtest.class=InstallCommandIntegrationTest`

Manually renamed `iOS Simulator.app` to `Simulator.app`, re-ran test,
confirmed it still passed.

Manually renamed `iOS Simulator.app` to `x.app`, re-ran test, confirmed
it failed with error:

  BUILD FAILED: Cannot install //:DemoApp (could not find simulator under /Applications/Xcode.app/Contents/Developer/Applications, checked [Simulator.app, iOS Simulator.app])

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