Avoid boost include order issue on windows:

http://stackoverflow.com/questions/9750344/boostasio-winsock-and-winsock-2-compatibility-issue
http://stackoverflow.com/questions/9750344/boostasio-winsock-and-winsock-2-compatibility-issue/16288859#16288859

Make sure boost/asio.hpp is included before windows.h.

TestHelper.cpp

@@ -23,6 +23,7 @@
 
 #include <thread>
 #include <chrono>
+#include <boost/asio.hpp>
 #include <boost/filesystem/path.hpp>
 #include <libethereum/Client.h>
 #include <liblll/Compiler.h>

fork.cpp

@@ -19,7 +19,7 @@
  * @date 2014
  * Tests for different forking behavior
  */
-
+#include <boost/asio.hpp>
 #include <boost/test/unit_test.hpp>
 #include <boost/filesystem/operations.hpp>
 #include <libethereum/Client.h>

txTest.cpp

@@ -19,7 +19,7 @@
  * @date 2014
  * Simple peer transaction send test.
  */
-
+#include <boost/asio.hpp>
 #include <boost/test/unit_test.hpp>
 #include <boost/filesystem/operations.hpp>
 #include <libethereum/Client.h>

whisperTopic.cpp

@@ -19,6 +19,7 @@
  * @date 2014
  */
 #include <functional>
+#include <boost/asio.hpp>
 #include <boost/test/unit_test.hpp>
 #include <libp2p/Host.h>
 #include <libwhisper/WhisperPeer.h>