fix complex media query support

Author: tj

lib/lexer.js

@@ -37,7 +37,7 @@ var pseudos = [
  */
 
 pseudos = pseudos.join('|');
-var propre = new RegExp('^ *([^:\n]+):(?!' + pseudos + ') *([^\n]*)');
+var propre = new RegExp('^ *([-\\w]+):(?!' + pseudos + ') *([^\n]*)');
 
 /**
  * Scan the given `str` returning tokens.

test/cases/media.complex.out.css

@@ -0,0 +1,6 @@
+@media only screen and (min-device-width: 320px) and (max-device-width: 480px) {
+  body {
+    width: 480px;
+    height: 500px;
+  }
+}