Use --local for bundler in CI

Change-Id: I29645cbc2f58d0a5beca2fe09f8794156a3aa50c
Remove cruft from tests

Change-Id: I781a802f056f7610ee58ad98b3e6d2b48dd1b20f
Don't require ruby gems and bundler in the bin script

Change-Id: I14b8fd11ca7df54b0af102a3e91f57d28350fcb3