v0.6.0

Plugins - We now support user-defined plugins that can extend Ark functionality to meet your custom backup/restore needs without needing to be compiled into the core binary. We support pluggable block and object stores as well as per-item backup and restore actions that can execute arbitrary logic, including modifying the items being backed up or restored. For more information see the documentation, which includes a reference to a fully-functional sample plugin repository. (#174 #188 #206 #213 #215 #217 #223 #226)
Describers - The Ark CLI now includes describe commands for backups, restores, and schedules that provide human-friendly representations of the relevant API objects.

The config object format has changed. In order to upgrade to v0.6.0, the config object will have to be updated to match the new format. See the examples and documentation for more information.
The restore object format has changed. The warnings and errors fields are now ints containing the counts, while full warnings and errors are now stored in the object store instead of etcd. Restore objects created prior to v.0.6.0 should be deleted, or a new bucket used, and the old restore objects deleted from Kubernetes (kubectl -n heptio-ark delete restore --all).

Add ark plugin add and ark plugin remove commands #217, @skriss
Add plugin support for block/object stores, backup/restore item actions #174 #188 #206 #213 #215 #223 #226, @skriss @ncdc
Improve Azure deployment instructions #216, @ncdc
Change default TTL for backups to 30 days #204, @nrb
Improve logging for backups and restores #199, @ncdc
Add ark backup describe, ark schedule describe #196, @ncdc
Add ark restore describe and move restore warnings/errors to object storage #173 #201 #202, @ncdc
Upgrade to client-go v5.0.1, kubernetes v1.8.2 #157, @ncdc
Add Travis CI support #165 #166, @ncdc

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