* Build .deb packages for some architectures on CI to publish on GitHub
* Add release binaries to archive root, update Cargo.toml
* Simplify Debian package building using cargo-deb tooling
* Update LICENSE file copyright statement
* Update Travis CI script to properly build Debian release packages
* Remove obsolete Debian package files
* Update Cargo.toml and Cargo.lock, add create_deb prototype for source package