Added [!mayfail] tag to indicate test case that can fail without failing the suite.

Overhauled the summary report (including the expected failure count)

include/internal/catch_console_colour.hpp

@@ -37,8 +37,10 @@ namespace Catch {
 
             // By intention
             FileName = LightGrey,
+            Warning = Yellow,
             ResultError = BrightRed,
             ResultSuccess = BrightGreen,
+            ResultExpectedFailure = Warning,
 
             Error = BrightRed,
             Success = Green,
@@ -62,6 +64,8 @@ namespace Catch {
         static Detail::IColourImpl* impl();
     };
 
+    inline std::ostream& operator << ( std::ostream& os, Colour const& ) { return os; }
+
 } // end namespace Catch
 
 #endif // TWOBLUECUBES_CATCH_CONSOLE_COLOUR_HPP_INCLUDED