libjpeg-turbo8 dependency incorrect on Raspbian

[Fnoop]

The documented libjpeg-turbo8 dependency is not available on Raspbian (Raspberry Pi Debian). It looks like the package might be called libturbojpeg1-dev, on Raspbian, but not sure.

[Stephen Dade]

Thanks for catching that. I've edited the documentation to reflect this (http://canberrauav.github.io/cuav/build/html/installing/index.html).