Add test for creating features when name is not unique

.jshintrc

@@ -37,7 +37,7 @@
     "trailing"      : true,
     "maxparams"     : 3,
     "maxdepth"      : 4,
-    "maxstatements" : 10,
+    "maxstatements" : 20,
     "maxcomplexity" : 10,
     "maxlen"        : 120,
 

test/featureApiSpec.js

@@ -88,4 +88,12 @@ describe('The features api', function () {
             .expect(404, done);
     });
 
+    it('refuses to create a feature with an existing name', function (done) {
+        request
+            .post('/features')
+            .send({name: 'featureX'})
+            .set('Content-Type', 'application/json')
+            .expect(403, done);
+    });
+
 });