Tags beginning with a non alpha-numeric character are now disallowed.

Added !throws special tag which denotes a test case to be skipped when run with -e
(the idea being that the test case is expected to throw an exception which is not caught within a XXX_THROWS assertion).

include/internal/catch_interfaces_config.h

@@ -10,6 +10,7 @@
 
 #include <iostream>
 #include <string>
+#include <vector>
 
 #include "catch_ptr.hpp"
 
@@ -32,6 +33,8 @@ namespace Catch {
         Never
     }; };
 
+    class TestCaseFilters;
+
     struct IConfig : IShared {
 
         virtual ~IConfig();
@@ -44,6 +47,7 @@ namespace Catch {
         virtual bool warnAboutMissingAssertions() const = 0;
         virtual int abortAfter() const = 0;
         virtual ShowDurations::OrNot showDurations() const = 0;
+        virtual std::vector<TestCaseFilters> const& filters() const = 0;
     };
 }