add total results reder

lib/message.js

@@ -101,6 +101,13 @@ Object.defineProperties(Message.prototype, {
     }
   },
 
+  total: {
+    get: function () {
+      if (!this.res) return undefined;
+      return parseInt(this.headers['total-results'], 10);
+    }
+  },
+
   /**
    * The response's HTTP status code.
    *
@@ -147,6 +154,10 @@ Object.defineProperties(Message.prototype, {
 
 // --- Message Prototype Methods ---
 
+Message.prototype.isList = function () {
+  return this.type === 'json' && Array.isArray(this.data);
+};
+
 /**
  * Resets the message state; use if you need to reuse
  * a message object.
@@ -359,7 +370,7 @@ function reader(obj, name, value) {
   var descriptor = { configurable: true };
 
   if (typeof value === 'function') {
-    descriptor.get = value; 
+    descriptor.get = value;
   } else {
     descriptor.value = value;
   }

lib/zotero.js

@@ -15,7 +15,7 @@ var Message = require('./message');
  * as easy as possible to bootstrap a Zotero client application in Node.js;
  * it comes with hardly any runtime dependencies and provides three simple
  * abstractions to interact with Zotero: `Client`, `Library`, and `Message`.
- * 
+ *
  * Clients handle the HTTPS connection to a Zotero data server, observing
  * any rate-limiting directives issued by the server; you can configure
  * settings (like API versions, default headers etc.) for each Client.