Fixed 'promise-timeout' usage

Fixed

• require of promise-timeout.

Fixed `require` Statement

Fixed

• Change require("timeout") to require("promise-timeout").

SSH Improvements

Added

• TestMachine takes sshUser option
  • Implemented in GCETestMachine#ssh
• Moved SSH timeout logic from GCETestMachine#ssh to TestMachine#ensureStarted
• Added --quiet flag to GCETestMachine#ssh as
  suggested
  in the gcloud docs.

Added ssh timeout

Added

• TestMachine takes configurable options (TestMachineOptions)
• TestMachine takes sshTimeout option
  • Implemented in GCETestMachine#ssh

First Release

v0.1.0

First release.