Use package:sky imports consistently

sky/sdk/lib/widgets/floating_action_button.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'basic.dart';
-import 'button_base.dart';
-import 'icon.dart';
-import 'ink_well.dart';
-import 'material.dart';
-import 'theme.dart';
+import 'package:sky/widgets/basic.dart';
+import 'package:sky/widgets/button_base.dart';
+import 'package:sky/widgets/icon.dart';
+import 'package:sky/widgets/ink_well.dart';
+import 'package:sky/widgets/material.dart';
+import 'package:sky/widgets/theme.dart';
 
 // TODO(eseidel): This needs to change based on device size?
 // http://www.google.com/design/spec/layout/metrics-keylines.html#metrics-keylines-keylines-spacing
 const double _kSize = 56.0;
 
 class FloatingActionButton extends ButtonBase {
 
   FloatingActionButton({
     String key,
     this.child,
@@ skipping 42 matching lines @@
                 )
               )
             )
           )
         )
       )
     );
   }
 
 }