Add convenience method.

src/core/fresh-resume.js

@@ -202,6 +202,13 @@ Definition of the FRESHResume class.
     return this;
   };
 
+  /**
+  Return the resume format.
+  */
+  FreshResume.prototype.format = function() {
+    return 'FRESH';
+  };
+
   /**
   Initialize the the FreshResume from string data.
   */

src/core/jrs-resume.js

@@ -70,6 +70,13 @@ Definition of the JRSResume class.
 
   };
 
+  /**
+  Return the resume format.
+  */
+  JRSResume.prototype.format = function() {
+    return 'JRS';
+  };
+
   /**
   Convert this object to a JSON string, sanitizing meta-properties along the
   way. Don't override .toString().