Added missing client validations for blog title and user/subscriber email fields (#909)

refs TryGhost/Ghost#8143

Added more client side validations for input fields:

- Blog title in setup flow (150 chars)
- User email (191 chars)
- Subscribers email (191 chars)

ghost/admin/app/validators/setup.js

@@ -10,5 +10,10 @@ export default NewUserValidator.create({
             model.get('errors').add('blogTitle', 'Please enter a blog title.');
             this.invalidate();
         }
+
+        if (!validator.isLength(blogTitle, 0, 150)) {
+            model.get('errors').add('blogTitle', 'Title is too long');
+            this.invalidate();
+        }
     }
 });

ghost/admin/app/validators/subscriber.js

@@ -14,6 +14,10 @@ export default BaseValidator.create({
             model.get('errors').add('email', 'Invalid email.');
             model.get('hasValidated').pushObject('email');
             this.invalidate();
+        } else if (!validator.isLength(email, 0, 191)) {
+            model.get('errors').add('email', 'Email is too long');
+            model.get('hasValidated').pushObject('email');
+            this.invalidate();
         }
     }
 });

ghost/admin/app/validators/user.js

@@ -40,6 +40,11 @@ export default PasswordValidator.create({
             model.get('errors').add('email', 'Please supply a valid email address');
             this.invalidate();
         }
+
+        if (!validator.isLength(email, 0, 191)) {
+            model.get('errors').add('email', 'Email is too long');
+            this.invalidate();
+        }
     },
 
     location(model) {