remove most of cmd; change things to use it
add cmd dependency
Merge branch 'master' of github.com:juju/juju into 010-use-external-cmd

Conflicts:
	cmd/charm-admin/config.go
	cmd/charm-admin/config_test.go
	cmd/charm-admin/deletecharm.go
	cmd/charm-admin/main.go
	dependencies.tsv
update dependencies.tsv
Merge pull request #93 from rogpeppe/010-use-external-cmd

all: use extern charm package

We delete almost all of the juju cmd package, just adding two helper functions
for creating juju-specific SuperCommands.