Update property values

[frvge]

• Add space-evenly and potentially others to justify-content (https://developer.mozilla.org/en-US/docs/Web/CSS/justify-content)
• Add break-word and potentially others to word-break (https://developer.mozilla.org/en-US/docs/Web/CSS/word-break)

Locations for a fix: https://github.com/CSSLint/parser-lib/blob/master/src/css/Properties.js#L290 and https://github.com/CSSLint/parser-lib/blob/master/src/css/Properties.js#L488

See CSSLint/csslint#757