Add attach command to weave.
attach command that accepts and existing container id and runs configure_container_networking using it
Stop waiting for interface after 5 seconds
Add section to README on reboots
Merge branch 'add-attach' of https://github.com/adieu/weave into 67_attach
Merge branch 'master' of https://github.com/binocarlos/weave into 67_attach

Conflicts:
	weaver/weave
Merge remote-tracking branch 'upstream/master' into 67_attach
Add detach command
Untabify
Described attach and detach commands
log.Fatal() does os.Exit(1) so we don't need to do it again
Change -wait from bool to int number of seconds to wait
Redesigned attach/detach
Updated instructions for attach and detach
Improved test for blank string
Make attach and detach idempotent
Merge branch '67_attach' of https://github.com/bboreham/weave into bboreham-67_attach
Merge branch '67_attach' of https://github.com/bboreham/weave into bboreham-67_attach
tweak & move docs for 'attach' and 'detach'
Capture error output from ip command and check if error was caused by container dying