drop IP/network from 'weave launch'
plus a whole bunch of other small changes to weave script which I'll
eventually extract into separate commits.
drop IP/network from 'weave launch'
plus a whole bunch of other small changes to weave script which I'll
eventually extract into separate commits.
fix 'weave start' post rebase
Merge branch '130_launch_without_ip' of github.com:rade/weave into 130_launch_without_ip

Conflicts:
	weave
get error handling right
simplify code for attach
update README
Merge branch 'master' into 130_launch_without_ip

Conflicts:
	weave
backward compatibility
Merge branch 'master' into 130_launch_without_ip

Plus a bit of a refactoring, to avoid duplicating the CIDR
regexp. Plus some minor cosmetic tweaks.

Conflicts:
	README.md
	weave
refactor: extract basic container/bridge connection establishment
Note that we do not mark the interface in the container as 'up' here
since some callers, in particular 'attach', add CIDRs to the
interface, and some programs rely on 'up' implying 'has IP address'.
cosmetic