v0.4.0

New feature:

• use return code to determine whether to restart hive-cli(6d5ffe9) (by Alexander Neumann)
• return code 3 when restart is required(1abd867) (by Alexander Neumann)
• check for cli update when repo update requested(71987e7) (by Alexander Neumann)
• move HIVE_HOST away from config(c4a8332) (by Alexander Neumann)
• use observer for docker state change in frontend; linting(dc263dc) (by Alexander Neumann)
• add linting(e80849a) (by Alexander Neumann)

Bugs fixed:

• dont override env when recipe os none(7da6d35) (by Alexander Neumann)
• assume update when local image is not found remotely(384fdd1) (by Alexander Neumann)
• log formatting(ed9dd49) (by Alexander Neumann)

Full Changelog: v0.3.1...v0.4.0