... ruby/gems/2.1.0/gems/bundler-1.6.2/lib/bundler/runtime.rb:222: warning: Insecure world writable dir /Users in PATH, mode 040777
That indicates that the /Users directory has an insecure file permission setting. Solution Tighten up security on the /Users directory like this:
$ sudo chmod 040755 /Users
The "040" is the file type flag representing a directory.
Here's what the permissions should look like:
$ ls -l / | grep Users drwxr-xr-x@ 6 root admin 204 Apr 10 15:25 Users