File mailsettings.java has 321 lines of code (exceeds 250 allowed). Consider refactoring.

Take each of the examples and make them their own file.
Then create a README file that links to each example.

https://codeclimate.com/github/sendgrid/sendgrid-java/examples/mailsettings/mailsettings.java#issue_59f382f3ba92590001000055