README.md (microkernel): point to generic microkernel-latest.tar link

We were pointing people at the outdated microkernel-001; the -latest link
will make sure people always get the very latest.
* bin/razor-admin: drop the power_state type

Without that, reset-database will not return the database to a pristine
state and the following creation of the schema will fail.
Rename 'recipe' to 'task'

The word 'recipe' is used by other tools (e.g., Chef) for things that
aren't quite the same as what we are talking about in the context of Razor;
to avoid confusion, we are renaming recipes to the more generic word
'task', which still captures that this is about performing some sort of
work against nodes.

This is a follow-on to the renaming of installers to recipes in commit
a9f81b5f and mirrors that closely.
PE broker: rename 'latest' link to 'current'

The PE installer team decided to rename the link, and we follow suit
reinstall-node: produce some output for unbound, not installed ndoes

If a node exists, but requires no action for reinstall, we sued to not
return any human-readable message. We now do.

Fixes https://tickets.puppetlabs.com/browse/RAZOR-82
Version 0.13.0
Merge branch 'master' of https://github.com/puppetlabs/razor-server