Update src/css/MediaQuery.js

MediaQuery mediaType and features needs to be joined trough "and".
For example parsing "only screen and (min-width:450px) and (max-width:1950px)", the text output will be
"only screen (min-width:450px) and (max-width:1950px)".
It is parsed right but the new text string will be invalid if matched with window.matchMedia.

Author: mirceapiturca

src/css/MediaQuery.js

@@ -13,7 +13,7 @@
  */
 function MediaQuery(modifier, mediaType, features, line, col){
 
-    SyntaxUnit.call(this, (modifier ? modifier + " ": "") + (mediaType ? mediaType + " " : "") + features.join(" and "), line, col, Parser.MEDIA_QUERY_TYPE);
+    SyntaxUnit.call(this, (modifier ? modifier + " ": "") + (mediaType ? mediaType : "") + (mediaType && features.length > 0 ? " and " : "") + features.join(" and "), line, col, Parser.MEDIA_QUERY_TYPE); 
 
     /**
      * The media modifier ("not" or "only")