Upgraded read tag to use resolution keyword method.

__read.cpp

@@ -13,6 +13,8 @@ namespace jet {
 	throw coreutils::Exception("name keyword must be specified.");
       if(hasContainer)
 	throw coreutils::Exception("read tag does not have a container.");
+      resolveKeyword("file");
+      resolveKeyword("name");
       fd = open(variables["file"].c_str(), O_RDONLY);
       if(fd < 0)
 	throw coreutils::Exception("file name is not found.");