Move all samples but swarm from client/samples/ to samples/ .

client/samples/dartcombat/README

-Copyright (c) 2011, 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.
-
-Dartcombat is a sample game which illustrates how to use isolate communication
-and futures.
-
-Building and running:
-
-1. go to the top-level directory of the project:
-  $ cd dart/
-
-2. build the dartc compiler:
-  $ ./tools/build.py --arch=ia32
-
-3. run the htmlconverter tool, that converts the dart code to javascript:
-  $ python ./client/tools/htmlconverter.py \
-      client/samples/dartcombat/dartcombat.html -o out/
-
-4. open the generated file in a browser:
-  $ google-chrome out/client/samples/dartcombat/dartcombat-js.html
-
-Using dartcombat:
-
-Dartcombat works as follows:
-- screen: The screen shows 4 grids. On the left is what player1 knows (his board
-  in detail, and his partial knowledge of player2's board), on the right is what
-  player2 knows.
-
-- setup: You can place boats on the top boards by clicking and dragging the
-  mouse.
-
-- shooting: You can shoot by clicking on the bottom grids. To highlight isolate
-  communication and futures, we made each click a supershoot: if a boat is hit,
-  the player will automatically scan all cells around the initial shot, and
-  progresively hit the boat and sink it.