Added [!nonportable] tag

include/internal/catch_test_case_info.h

@@ -29,7 +29,8 @@ namespace Catch {
             IsHidden = 1 << 1,
             ShouldFail = 1 << 2,
             MayFail = 1 << 3,
-            Throws = 1 << 4
+            Throws = 1 << 4,
+            NonPortable = 1 << 5
         };
 
         TestCaseInfo(   std::string const& _name,

include/internal/catch_test_case_info.hpp

@@ -26,6 +26,8 @@ namespace Catch {
             return TestCaseInfo::ShouldFail;
         else if( tag == "!mayfail" )
             return TestCaseInfo::MayFail;
+        else if( tag == "!nonportable" )
+            return TestCaseInfo::NonPortable;
         else
             return TestCaseInfo::None;
     }