Juan Cruz Viotti 1bc78edf71 Refactor help module
Main changes:

- Use the `columnify` module to display the commands instead of using
manual parsing.

- Extract logic to create a string representation from an option
signature to Capitano, and reuse here.

See https://github.com/resin-io/capitano/pull/28

Some bugs were caught and fixes during the refactoring:

- In command help, if the command didn't exist, we reused default
Capitanos command not found function which uses `process.exit(1)`. This
was changed to pass a custom error to `done()`, so the command fails
correctly when using programatically.

- General help didn't call `done()` at all, thus causing problems if
using the command programatically someday.
2015-08-13 14:19:07 -04:00
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