Modernizr 2.6.2 causes exception with cssparser 0.9.7

[dstevenson]

Celerity comes bundled with cssparser-0.9.7.

When using celerity on an application that uses Modernizr 2.6.2, cssparser will throw an exception

CSSRule com.steadystate.css.dom.CSSUnknownRuleImpl is not yet supported.

Using the latest cssparser 0.9.9 does not fix the issue.

To fix this issue we forked celerity and downgraded cssparser to 0.9.4.

Hope this helps someone.