New unit_test framework:

* Header-only!
* No external dependencies or other beast modules
* Compilation options allow for:
  - Stand-alone application to run a single test suite
  - Stand-alone application to run a set of test suites
  - Global suite of tests inline with the host application
  - Disable test suite generation completely
* Existing tests reworked to use the new classes

beast/net/impl/IPAddressV4.cpp

@@ -17,7 +17,14 @@
 */
 //==============================================================================
 
+#if BEAST_INCLUDE_BEASTCONFIG
+#include "../../BeastConfig.h"
+#endif
+
 #include "../IPAddressV4.h"
+#include "../detail/Parse.h"
+
+#include <sstream>
 
 namespace beast {
 namespace IP {