Split up codebase into the packages @clsterio/lib, @clusterio/master,
@clusterio/slave, and @clusterio/ctl using lerna to manage them. This
will allow deployment to use only the parts needed reducing install
size, and better separate the code into shared library, master, slave
and control.
Simplify getNewestFile by converting it to an async function, use the
fs-extra promise based fs functions and remove the files argument as
well as the callback.
Refactors the tests as well to use the test/temp folder.
Hornwitser