Provide a person#pending method for parity with the ruby lib

src/person.js

@@ -8,6 +8,10 @@ module.exports = function (client) {
     _.extend(this, data);
   }
 
+  Person.prototype.pending = function () {
+    return !this.id;
+  };
+
   Person.find = function (options) {
     assert(options && options.email, 'An email must be provided');
     return this.client.request(_.extend({

test/person.js

@@ -18,6 +18,17 @@ describe('Person', function () {
     mock.done();
   });
 
+  describe('#pending', function () {
+
+    it('identifies whether the person has an id', function () {
+      var person = new Person();
+      expect(person.pending()).to.be.true;
+      person.id = 'foo';
+      expect(person.pending()).to.be.false;
+    });
+
+  });
+
   describe('Person#find', function () {
 
     it('can find a person by email', function () {