Update intl to new import syntax

pkg/intl/lib/number_format.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#library("number_format");
+library number_format;
 
-#import('dart:math');
+import 'dart:math';
 
-#import("intl.dart");
-#import("number_symbols.dart");
-#import("number_symbols_data.dart");
+import "intl.dart";
+import "number_symbols.dart";
+import "number_symbols_data.dart";
 
 class NumberFormat {
   /** Variables to determine how number printing behaves. */
   // TODO(alanknight): If these remain as variables and are set based on the
   // pattern, can we make them final?
   String _negativePrefix = '-';
   String _positivePrefix = '';
   String _negativeSuffix = '';
   String _positiveSuffix = '';
   /** How many numbers in a group when using punctuation to group digits in
@@ skipping 250 matching lines @@
   }
 
   /**
    * Returns the suffix for [x] based on wether it's positive or negative.
    * In en_US there are no suffixes for positive or negative.
    */
   String _signSuffix(num x) {
     return x.isNegative ? _negativeSuffix : _positiveSuffix;
   }
 }