Exit with failure if the RSpec integration fails
Pull Tunnel and Server startup into methods for RSpec
Switched :suite to :all for RSpec.

RSpec currently ignores conditions on :suite, so Sauce Connect and a
Rails server were starting for all test runs.

Changed this to :all and made rails server and connect startup
idempotent.
Merge pull request #216 from DylanLacey/master

Don't always start a Sauce Connect tunnel