Fixed issue with path containing spaces

Summary:
If the project is in a folder with a path containing a space, the project won't build. This fixes this issue.
Closes https://github.com/facebook/react-native/pull/15608

Differential Revision: D5686861

Pulled By: shergin

fbshipit-source-id: 74ce5b4f0261c18070c1a48966aae24f1ca75492

scripts/react-native-xcode.sh

@@ -105,7 +105,7 @@ fi
 
 BUNDLE_FILE="$DEST/main.jsbundle"
 
-$NODE_BINARY $CLI_PATH bundle \
+$NODE_BINARY "$CLI_PATH" bundle \
   --entry-file "$ENTRY_FILE" \
   --platform ios \
   --dev $DEV \