Deletes whitespace to fix test.

[ebolloff]

This should fix

Failure/Error: it{ subject.errors[:key].should == ["is not a public key file."] }
       expected: ["is not a public key file."]
            got: ["is not a public key file.\r"] (using ==)
     # ./spec/models/key_spec.rb:34:in `block (4 levels) in <top (required)>'

[eugenk]

👍