[#25,model][s]: introduce new Field Model and FieldList collection and attach to Dataset.

* NB: no refactoring elsewhere yet to take account of this
* model.test.js: tests for Field (first proper model tests!)

test/index.html

@@ -17,6 +17,7 @@
   <script src="sinon-qunit/1.0.0/sinon-qunit.js"></script>
 
   <script type="text/javascript" src="../src/model.js"></script>
+  <script type="text/javascript" src="model.test.js"></script>
   <script type="text/javascript" src="../src/backend.js"></script>
   <script type="text/javascript" src="backend.test.js"></script>
   <script type="text/javascript" src="../src/view.js"></script>

test/model.test.js

@@ -0,0 +1,21 @@
+(function ($) {
+module("Model");
+
+test('Field: basics', function () {
+  var field = new recline.Model.Field({
+    id: 'x'
+  });
+  equal(field.attributes.label, 'x', 'Field label should be set from id');
+
+  var field = new recline.Model.Field({
+    id: 'x',
+    label: 'My label'
+  });
+  equal(field.attributes.label, 'My label', 'Field label should be set from id but not if explicitly provided');
+
+  var field = new recline.Model.Field('x');
+  equal(field.id, 'x', 'Set of id from single argumentst to ctor');
+  equal(field.attributes.id, 'x', 'Set of id from single argumentst to ctor');
+});
+
+})(this.jQuery);