title: React native error - react-native-xcode.sh: line 45: react-native: command not found Command /bin/sh failed with exit code 127
body: <p>I get this error when trying to build any (new or old) project. 
  My node is on version 4.2.1 and react-native is on version 0.1.7. 
  I've looked at other people with the same problem so I've updated react-native to the latest version however I still cannot build any project through xcode.</p>