Use a module for deploy task instead of code in Cakefile

I've taken much of the work done by @jarl-dk and refactored it into its own repository [ftpkick](https://github.com/saebekassebil/ftpkick) (naming that thing turned out to be quite hard...)

This shouldn't affect your settings or workflow in any way, but merely lessen the complexity of the `Cakefile`