Fix column escape in args (#47)

[gluck]

• use same char escapes as npm (see npm completion output)
• avoid COMP_WORDBREAKS override

[gluck]

(tested on ubuntu)

[dsifford]

@dkarlovi can you confirm this resolves your issue on macos?

[dkarlovi]

@dsifford I can confirm this works for me, it even doesn't inline the backslash the way mvn does in #47 so it's seamless. Great job @gluck, thank you for working on this!

I'm not on OSX though, I'm on Fedora.

[dsifford]

Would love to get someone who has access to OSX to confirm this still works for them because that was the specific pain point when I initially wrote the completions.

Once that happens, I'd be happy to merge this in.

[dkarlovi]

I've asked a few OSX people and it seems Apple doesn't ship Bash 4+ because of GPL 3. They either use zsh or Bash 3.

[dsifford]

Yeah, apple is locked in at bash 3. But you can still use homebrew to install modern bash and bash completions.

Those are the demographic I'd like to hear about if possible.

[dsifford]

Oh whoops. Forgot that I have tests for macOS already running (and passing) on this PR.

Cool, let's merge this. Thanks @gluck!