consistency
nicer error message on 'weave status' when there is no weave container.
simplify error message
nicer error on 'weave stop' and make it idempotent
make 'weave launch' cope gracefully with existing 'weave' containers
Fixed #31
Merge remote-tracking branch 'upstream/master' into 23_retry_peers
refactoring
- rename addToTargets to addTarget
- immediately add to cm.targets; the phasing was unnecessary
- don't normalise addresses in addTarget - they are already normalised