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_app/tx/TransactionEngine.cpp

@@ -17,6 +17,8 @@
 */
 //==============================================================================
 
+namespace ripple {
+
 //
 // XXX Make sure all fields are recognized in transactions.
 //
@@ -222,4 +224,4 @@ TER TransactionEngine::applyTransaction (const SerializedTransaction& txn, Trans
     return terResult;
 }
 
-// vim:ts=4
+} // ripple