Fix Issues #29 and #30 (for feature/modernizr-3.0 branch).  Involved using separate RegExp for JS files vs CSS(-ish) files.  Takes optional class prefix into account
Merge remote-tracking branch 'dave/feature/modernizr-3.0-fix-css-false-positives' into feature/modernizr-3.0
Adding / Restructuring tests for prefixed classes. Resolves #40.