fix indentation of multiple selectors in @media. Closes #11

Author: tj

examples/media.css

@@ -16,8 +16,9 @@
     color: #000;
   }
 
-  body {
+  body,
+  #content {
     padding: 1in;
     border: 0.5pt solid #666;
   }
-}
+}

index.js

@@ -137,14 +137,16 @@ Compiler.prototype.keyframe = function(node){
  */
 
 Compiler.prototype.rule = function(node){
+  var indent = this.indent();
+
   if (this.compress) {
     return node.selectors.join(',')
       + '{'
       + node.declarations.map(this.declaration, this).join(';')
       + '}';
   }
 
-  return this.indent() + node.selectors.join(',\n')
+  return node.selectors.map(function(s){ return indent + s }).join(',\n')
     + ' {\n'
     + this.indent(1)
     + node.declarations.map(this.declaration, this).join(';\n')