Implemented libidentify support

- see https://github.com/janwilmans/LibIdentify

include/internal/catch_commandline.hpp

@@ -211,6 +211,14 @@ namespace Catch {
             .describe( "should output be colourised" )
             .bind( &setUseColour, "yes|no" );
 
+        cli["--use-colour"]
+            .describe( "should output be colourised" )
+            .bind( &setUseColour, "yes|no" );
+
+        cli["--libidentify"]
+            .describe( "report name and version according to libidentify standard" )
+            .bind( &ConfigData::libIdentify );
+
         return cli;
     }