cli-spec: Sort the commands in the overview

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
cli-spec: Sort the whole document

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
cli-spec: add/remove, create/delete consistency

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Merge pull request #39 from stgraber/master

Update to the command line specification