Make default reporter configurable at compile time

Closes #978

include/catch_session.hpp

@@ -31,10 +31,14 @@ namespace Catch {
         return reporter;
     }
 
+#if !defined(CATCH_CONFIG_DEFAULT_REPORTER)
+#define CATCH_CONFIG_DEFAULT_REPORTER "console"
+#endif
+
     Ptr<IStreamingReporter> makeReporter( Ptr<Config> const& config ) {
         std::vector<std::string> reporters = config->getReporterNames();
         if( reporters.empty() )
-            reporters.push_back( "console" );
+            reporters.push_back( CATCH_CONFIG_DEFAULT_REPORTER );
 
         Ptr<IStreamingReporter> reporter;
         for( std::vector<std::string>::const_iterator it = reporters.begin(), itEnd = reporters.end();