Tock Version 1.0

This release is a companion to the main Tock 1.0 release: https://github.com/tock/tock/releases/tag/release-1.0-2018-02

At the time, libtock-c was included in the main repository. This repository was later split, and its history extracted. This is the state of the libtock-c folder during the 1.0 release, as well as pre-compiled images of each app from this tag.