fix commit "support --git CLI option"

[webkadiz]

you are great for adding --git support. But it breaks cli without specifying this option

you forgot to specify the default value for the --git option with the third argument (bin/gh-pages.js: 45)

.option('--git <git>', 'Path to git executable')

I have done it

.option('--git <git>', 'Path to git executable', 'git')

I also set the default values ​​for "tag" and "user" according to the documentation

[nytamin]

The defaults are currently added in
https://github.com/tschaub/gh-pages/blob/master/lib/index.js#L37
although the assigning of values doesn't work (that's what my PR #309 aims to fix).

Personally, I would vote for your fix though, but only while also removing that defaults implementation.

[webkadiz]

https://github.com/tschaub/gh-pages/blob/master/lib/index.js#L37
it probably works when executed in a script and not in cli

something like that:

// some-script.js

var ghpages = require('gh-pages');

ghpages.publish('dist', {
  branch: 'master',
  repo: 'https://example.com/other/repo.git'
},  function(err) {});

[lqs469]

This PR will fix this error in v2.1.0 when using CLI. and somebody has opened an issue about this #308

The "file" argument must be of type string. Received type undefined

That's the reason for this problem. Please merge it.

[tschaub]

Thanks for the contribution! The gh-pages@2.1.1 release includes a fix.