Support for multiple reporters

- can't (yet) specify different targets for each reporter (e.g. different files)

include/internal/catch_commandline.hpp

@@ -23,6 +23,7 @@ namespace Catch {
         config.abortAfter = x;
     }
     inline void addTestOrTags( ConfigData& config, std::string const& _testSpec ) { config.testsOrTags.push_back( _testSpec ); }
+    inline void addReporterName( ConfigData& config, std::string const& _reporterName ) { config.reporterNames.push_back( _reporterName ); }
 
     inline void addWarning( ConfigData& config, std::string const& _warning ) {
         if( _warning == "NoAssertions" )
@@ -116,7 +117,7 @@ namespace Catch {
         cli["-r"]["--reporter"]
 //            .placeholder( "name[:filename]" )
             .describe( "reporter to use (defaults to console)" )
-            .bind( &ConfigData::reporterName, "name" );
+            .bind( &addReporterName, "name" );
 
         cli["-n"]["--name"]
             .describe( "suite name" )