Updated to use ::class notation.

Signed-off-by: Graham Campbell <graham@cachethq.io>

Leaving models unguarded can cause all kinds of havoc if someone uses seeds in their tests.
Best to default to reguard after doing the seeds.

Eloquent and Seeder were used to extend from which is a bad practice.
The SoftDeletingTrait should be imported just like the UserTrait and the RemindableTrait.
Str was also removed because it's just a shortcut for the namespace. People can always re-add it if they like.
I wasn't entirely sure what FormRequest was doing here but I have a feeling it's going to be used for the same reasons as one of the above classes. So I removed it as well.