@jbenet @mappum

Yeah, there's some duplicated work. But there's also a separation of
concerns. In one case, we check to determine where the command should
run. In the other case, we check to determine which hooks should run.
Having these actions separated reduces complexity in a nice way.

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

impl errorf

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

return a debug error

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

Commands Refactor Part 2 - rebased

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

ipfs1 docs read:

```
btc λ. ipfs pin
ipfs pin -

Commands:

        add         pin an ipfs object to local storage.
        rm          unpin an ipfs object from local storage.

        Use "pin help <command>" for more information about a command.
```

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

(The file path is omitted, but since only one object can be added at a time, I think this is ok)

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

not immediately useful, but nice to have

tagging you to make sure i didn't make a mistake here @jbenet

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

eg.

```
ipfs2 (cmd-ref-part2) λ. go build ./...; ./ipfs2 tour 0

Tour 0 - Hello Mars

Hello Mars

ipfs2 (cmd-ref-part2) λ. go build ./...; ./ipfs2 tour 10

ERROR
    no topic with id: 10

TOPICS

    0 - Hello Mars
    0.1 - Hello Mars 2

```