Added cutoff option to command line

Aborts testing after a certain number of assertion failures

include/catch_runner.hpp

@@ -84,6 +84,7 @@ namespace Catch {
             << "\t-s, --success\n"
             << "\t-b, --break\n"
             << "\t-n, --name <name>\n\n"
+            << "\t-c, --cutoff [#]\n\n"
             << "For more detail usage please see: https://github.com/philsquared/Catch/wiki/Command-line" << std::endl;    
     }
     inline void showHelp( std::string exeName ) {