Optimize regex used for identifying whitespace

fixes dwins#27

Author: dwins

geocss/src/main/scala/org/geoscript/geocss/CssParser.scala

@@ -15,7 +15,7 @@ import org.geotools.filter.text.ecql.ECQL
  * @author David Winslow <[email protected]>
  */
 object CssParser extends RegexParsers {
-  override val whiteSpace = """(\s|/\*([^/]|[^*]/)*\*/)+""".r
+  override val whiteSpace = """(?s)(?:\s|/\*.*?\*/)+""".r
 
   private val expressionPartial =
     new PartialFunction[String,Expression] {