Allow Customization of Verify Email Template

[erikwestlund]

Is your feature request related to a problem? Please describe.
Problem.
What do we currently have to do now?
The email verification template currently hardcodes "Masonite" into it. You can change the view template and hardcore different values. If you want to send anything dynamic (like the App Name) to the render function for the email, then you also then must pull out a custom MustVerifyMail class to include those variables.

Describe the solution you'd like
As a default, I wouldn't put "Masonite" but the app name in the email template.

I'd think of a way to make it easier to customize the email template, like at least sending a view values from the app config to the email render function in the MustVerifyMail class to allow for some easy wins in customizing that template.