bump parserlib to v0.2.4; fixes #443

[cvrebert]

Fixes #443.
See also CSSLint/parser-lib#69

[nschonni]

PS: because of the version globbing, this will already be installed for new installs. Can't hurt to bump the minimum version though

[ghost]

While this removes the error for the actual @Viewport rule, I now get the following error:

1: error at line undefined, col undefined
Fatal error, cannot continue: Cannot set property 'width' of undefined
undefined

This is for the following CSS:

@Viewport {
width:device-width;
}

It seems like the declarations aren't parsed properly. Could it be that parser-lib or csslint is looking for a selector, not a declaration, and that is what is causing the problem?

[cvrebert]

Ping.

[nschonni]

Fixed in #427