fix(registry): surface error from job unmarshal
refactor(registry): flatten Job field accessors

Move JobTargetState and JobTarget methods into the Job
and Jobs methods.
Merge pull request #595 from jonboulle/master

bump go-systemd d6fe9c492b1b3071bc78a16a7494fde163f62e25
Merge pull request #584 from bcwaldon/simplify-registry

Squash Registry methods JobTarget & JobTargetState into Job
fix(registry): use correct glog import path
Merge pull request #597 from bcwaldon/fix-import

fix(registry): use correct glog import path
chore(logging): Remove logs where verbosity > 1
Merge pull request #598 from bcwaldon/drop-overly-verbose-logs

chore(logging): Remove logs where verbosity > 1
refactor(job): Drop Job.UnitHash field
etcd-client: return a clearer error on action timeout
CONTRIBUTING: update to new commit style
MAINTAINERS: introduce file
Merge pull request #600 from bcwaldon/contributing

Update CONTRIBUTING.md; add MAINTAINERS
Merge pull request #596 from jonboulle/timeout

etcd-client: return a clearer error on action timeout
Merge pull request #599 from bcwaldon/drop-UnitHash

refactor(job): Drop Job.UnitHash field
job: make TargetState field a value, not ptr
agent: elevate unit state log level

Fix #585
Merge pull request #604 from bcwaldon/585

agent: elevate unit state log level
agent: expand logging of failed registry calls
fleetctl: drop -verbosity flag