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

src/ripple_core/functional/LoadMonitor.cpp

@@ -17,6 +17,8 @@
 */
 //==============================================================================
 
+namespace ripple {
+
 /*
 
 TODO
@@ -216,3 +218,5 @@ LoadMonitor::Stats LoadMonitor::getStats ()
 
     return stats;
 }
+
+} // ripple