.deb distribution

[ewnd9]

• https://github.com/unindented/electron-installer-debian
• upload releases from travis ci https://docs.travis-ci.com/user/deployment/releases/ 8333f98 - 4d78ace
• find a way to notify about new version
  • it's easier to upload to ubuntu software repository and automatically get updates
  • maybe https://github.com/yeoman/update-notifier
• add dependencies to *.deb https://github.com/unindented/electron-installer-debian#optionsdepends-et-al via options https://github.com/unindented/electron-installer-debian#options