Add the bad-string token to handle strings with an unescaped newline.

--HG--
extra : rebase_source : 11a26636fa92efe5b3e9215d58b9068ff956d2c4

Author: tabatkins

css3-syntax/Overview.html

@@ -455,7 +455,7 @@ <h3 id=tokenization><span class=secno>3.4. </span> Tokenization</h3>
    following tokens: ident, function, at-keyword, hash, string, url, bad-url,
    delim, number, percentage, dimension, unicode-range, whitespace, cdo, cdc,
    colon, semicolon, open-brace, close-brace, open-paren, close-paren,
-   open-bracket, close-bracket, includes-match, dash-match.
+   open-bracket, close-bracket.
 
   <p> Ident, function, at-keyword, hash, string, and url tokens have a value
    composed of zero or more characters. Delim tokens have a value composed of