Update require
Update require

That needs to go through efs to require package.json from current working directory - so from the directory user is in and invoking our global package, so we end up with his package.json, not with our own. That just moves out the path.join() logic.

CC: da39a3ee5e6b4b0d3255bfef95601890afd80709@Kureev
rnpm/rnpm