Allow border to be optional.

[roydukkey]

This tool has a lot of great features for creating boxes, and some of those features would be nice on their own. For instance, fullscreen would be great in some cases even without a border.

My use case, however, incorporates boxen into another utility. In order to achieve "no border", I have given boxen a "ghost border" which I strip after boxen's done working.

borderStyle: {
	topLeft: ' ',
	topRight: ' ',
	bottomLeft: ' ',
	bottomRight: ' ',
	top: ' ',
	bottom: ' ',
	left: ' ',
	right: ' '
}

[roydukkey]

@sindresorhus @Caesarovich

#88 is a good step forward, but I'm not sure it fully completes this issue.

// boxen@7.1.0
const result = boxen('toxic', { borderStyle: 'none', padding: 0, margin: 0 });
console.log(result.split('\n'));
//=> [ '', 'toxic', '' ]

When borderStyle = 'none'...

1. ...lines should only prepend text, when a padding, margin, or title are specified.
2. ...blank lines should append the text, when padding, margin, or height are specified.

Thoughts?

[roydukkey]

Similarly, width doesn't seem to behave properly either.

const text = 'toxic';
const result = boxen(text, { borderStyle: 'none', width: text.length });
console.log(result.split('\n'));
//=> [ '', 'tox', 'ic, '' ]