docker_1.6.2

What's Changed

• Ensure that writer queue is cleared when lock is canceled by @ddaspit in #486
• Update versions of core libraries including: by @johnml1135 in #487
• Add bugsnag by @johnml1135 in #488
• Better logging by @johnml1135 in #490
• When failing a ClearML update, log the headers by @johnml1135 in #493
• Avoid constantly attempting to acquire a lock by @ddaspit in #491

Full Changelog: docker_1.6.1...docker_1.6.2