Copyright year is wrong in the footer

[henke37]

It's 2017, not 2015.

[munificent]

It's retro! No, but really, copyrights don't need to be (and shouldn't be updated). They exist to note when I am first claiming copyright, not most recently. As long as I'm still alive and kicking, the copyright keeps going, so I don't need to re-establish it to a later date. :)