Rename sky.yaml to flutter.yaml

More flutter more better.

examples/fitness/BUILD.gn

@@ -6,7 +6,7 @@ import("//sky/build/sky_app.gni")
 
 sky_app("fitness") {
   main_dart = "lib/main.dart"
-  manifest = "sky.yaml"
+  manifest = "flutter.yaml"
 
   if (is_android) {
     apk_name = "Fitness"

examples/game/BUILD.gn

@@ -6,7 +6,7 @@ import("//sky/build/sky_app.gni")
 
 sky_app("game") {
   main_dart = "lib/main.dart"
-  manifest = "sky.yaml"
+  manifest = "flutter.yaml"
 
   if (is_android) {
     apk_name = "Asteroids"

examples/stocks/BUILD.gn

@@ -6,7 +6,7 @@ import("//sky/build/sky_app.gni")
 
 sky_app("stocks") {
   main_dart = "lib/main.dart"
-  manifest = "sky.yaml"
+  manifest = "flutter.yaml"
 
   if (is_android) {
     apk_name = "Stocks"

packages/updater/lib/main.dart

@@ -19,7 +19,7 @@ import 'pipe_to_file.dart';
 import 'version.dart';
 
 const String kManifestFile = 'sky.yaml';
-const String kBundleFile = 'app.flx';
+const String kBundleFile = 'flutter.flx';
 
 UpdateServiceProxy _initUpdateService() {
   UpdateServiceProxy updateService = new UpdateServiceProxy.unbound();