Add tests for input validation

[alexpghayes]

tidy()

• conf.int should be logical
• conf.level should be greater than zero and less than 1
• quick should be logical
• etc

glance()

• All arguments should be logical (I think? Pretty sure the only arguments are TRUE/FALSE switches that add more columns to the output)

augment()

• data / newdata must be coercable to tibbles
• type.predict and type.residuals should match.arg on the function they get passed to

All

• All named arguments should get evaluated (see #6)

[alexpghayes]

Probably the easiest way to test these would be write new tests in the vein of check_augment_function that take a specific method (i.e. tidy.Arima) and a fit model and see if they can break things.