[react-packager] Update sane to fix bug and add new features

Summary:
Updates sane to get:

1. Fix error plumbing (surface watchman errors correctly)
2. Better capability testing
3. Use watchman's globbing
4. Other minor fixes

package.json

@@ -66,7 +66,7 @@
     "react-tools": "git://github.com/facebook/react#b4e74e38e43ac53af8acd62c78c9213be0194245",
     "rebound": "0.0.13",
     "regenerator": "0.8.36",
-    "sane": "1.1.2",
+    "sane": "^1.2.0",
     "semver": "5.0.1",
     "source-map": "0.4.4",
     "stacktrace-parser": "0.1.3",