update elements and fix some bugs

lib/src/paper-progress/paper-progress.html

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 <link rel="import" href="../polymer/polymer.html">
-<link rel="import" href="../paper-styles/paper-styles.html">
-<link rel="import" href="../paper-styles/paper-styles-classes.html">
 <link rel="import" href="../iron-range-behavior/iron-range-behavior.html">
+<link rel="import" href="../paper-styles/color.html">
+<link rel="import" href="../iron-flex-layout/iron-flex-layout.html">
 
 <!--
 The progress bars are for situations where the percentage completed can be
 determined. They give users a quick sense of how much longer an operation
 will take.
 
 Example:
 
     <paper-progress value="10"></paper-progress>
 
@@ skipping 309 matching lines @@
       this.setAttribute('aria-disabled', disabled ? 'true' : 'false');
     },
 
     _hideSecondaryProgress: function(secondaryRatio) {
       return secondaryRatio === 0;
     }
 
   });
 
 </script>