Give config file precedence if it exists (avoids having to set env variables for s3 credentials)
Configure tootsie with a pebbles host, not full url
Use configured pebbles host, and set by default to tiramisu.dev
Merge branch 'tootsie-as-pebble'

* tootsie-as-pebble:
  Use configured pebbles host, and set by default to tiramisu.dev
  Configure tootsie with a pebbles host, not full url
  Give config file precedence if it exists (avoids having to set env variables for s3 credentials)