v0.15.0

New Features:

• Archive your tests for easy distribution!
  This will also be the underpinnings of clustered execution, see #140.
• timeout option for HTTP requests.
• userAgent option for HTTP requests.
• Request errors are no longer thrown, but logged as warnings.

Fixed:

• __ENV was broken in v0.13.0.
• insecureSkipTLSVerify was broken in v0.13.0.
• HTTP_PROXY/HTTPS_PROXY/NO_PROXY in the environment weren't respected properly.