Mardak's 3-tree idea

1. weave-stable: ready-to-ship
2. weave-dev: new features
3. weave-stage: stabilize features for weave-stable

• Bug fixes can land directly to weave-stable and those get pulled to weave-stage then to weave-dev.
• New reviewed & tested features land on weave-dev but might not be completely done.
• weave-stage pulls from weave-dev to shake out bugs that get fixed on weave-stage and pulled to weave-dev.
  • Feature fixes land on weave-dev before the feature reaches weave-stage.
• Once weave-stage is stable, weave-stable pulls the stable features then weave-stage pulls in a new set of features from weave-dev.