Made $[%name] to retrieve keyword values in a tag. Has bugs.

__if.cpp

@@ -34,7 +34,7 @@ namespace jet {
 	   throw coreutils::Exception("value2 should not be specified with expr.");
 	 if(keywordDefined("type"))
 	   throw coreutils::Exception("type should not be specified with expr.");
-	 booleanResult = Operand(keywords["expr"], global, parent->variables).boolean;
+	 booleanResult = Operand(keywords["expr"], global, parent->variables, keywords).boolean;
       }
       if(booleanResult) 
 	processContainer(container);