Update our testing bundle.
Update Ruby version to fix a CVE.
Tweaks to VM performance in Vagrant.
New Ansible has some better security tweaks for SSH.
Update RSpec helper syntax to 3.0.
Don't do the NFS thing, requires admin passwords too often.
Interface with the firewall with the iptables command.

It was always hacky to modify the iptables sysconfig file and
restart the firewall service -- much cleaner to call iptables
itself and then save out the configs each time we change them.
Install a custom bluepill gem to work around an issue.

We don't have a new cut of the gem to fix the issue at
bluepill-rb/bluepill#19, so package our own gem for the
moment...

Also, this commit switches us to using binstubs to start
Ruby executables rather than calling bundle, which should
be more reliable.
Spec tweaks for RSpec 3.