Fix Vault Config parsing of booleans

Add NOMAD_JOB_NAME to task environment

Documentation edits

These are things I noticed as I read through the documentation.
There are a couple of minor substantive corrections as well.

Skip SIGPIPE

Fix docker docs; add volumes/logging to changelog

Task runner integrates with TaskTemplateManager

Support Docker Volumes and Logging

Since containers are named with alloc ids it's difficult to use safely.
Not to mention task scheduling ordering issues could break it as well.

Consul template manager