Service rm

[subfuzion]

Closes #252

Verification

Merge #251 first.

$ make test

$ make install
$ amp service create --name pinger appcelerator/pinger
$ amp service rm pinger

$ amp service create --name pinger1 appcelerator/pinger
$ amp service create --name pinger2 appcelerator/pinger
$ amp service rm pinger1 pinger2

$ amp service create --name pinger1 appcelerator/pinger
$ amp service rm pinger1 pinger2
# verify pinger1 removed, good error for pinger2

[freignat91]

Tested ok

[generalhenry]

why ident instead of id?

[subfuzion]

making it clear it can be an ID, short ID, or name. Actually, that was something that @freignat91 recommended. I have no problem calling it id, which matches docker docs.

[generalhenry]

Sounds fine, it could use a comment to make that clear.

follow up: should RemoveResponse return an ident instead of an id?

[chrisccoy]

Looks good, needs rebase