Add allow statement

[akrawitz]

Adds the ability to allow specified rule violations on specific lines:

.foo.bar { /* csslint allow: adjoining-classes */
    margin: 0;
}
.baz.qux {
    fill: none !important; /* csslint allow: known-properties, important */
}

A rule violation is only allowed on the line with the csslint allow statement, and only for the rules listed on that line. This facilitates the use of CSSLint in cases where you generally agree with a rule, but recognize that there may be occasional exceptions. You can explicitly allow rule violations in your CSS file, without sacrificing the ability to detect other rule violations on the same line, or other instances of this particular rule violation on other lines. You can easily find these exceptions with a simple search for "csslint allow", and it is explicit what each exception is for.

[frvge]

👍 looks good to me

[frvge]

@akrawitz can you please prepare some documentation about this? You can already put it on the wiki with a [to be merged] warning or something. I think https://github.com/CSSLint/csslint/wiki/Ignoring-parts-of-CSS-during-linting would be a good page to add it.

[frvge]

I will merge this and create some documentation.

[akrawitz]

Thanks @frvge. Sorry I didn't get to the docs.