Remove unused directives. Fix typo in a comment.

[Crokus]

[ploeh]

Thank you for your interest in improving this code base.

I'd prefer not removing 'standard' namespaces, because, as @moodmosaic has already pointed out, you always end up having to add them again.

You could argue that this is just sample code, so maintainability probably doesn't matter as much as it would for a 'real' code base, but if that's the argument, then why bother removing any of the using directives in the first place?

[Crokus]

Originally I wanted to change the response from the Controller but looks like asking first was a good idea :)