Create Notification object for each flash notification

[jacurtis]

Instead of a collection of strings, I want to enhance this by making it a collection of Notification objects. This will make the project much more flexible and allow us to interact with it similar to Eloquent.

Notification

• public title - this allows you to add a title to a notification
• public message - the main content of the notification
• public type - this would be the type of notification such as error, success, info, or general
• public priority - this is an arbitrary integer to indicate priority similar to how z-index css property is managed.

[jacurtis]

We now use Notification object as of 9151358b69213bfcecc55b08b83bceef84bbf3b4