Merge pull request #110 from dobbymoodge/check-sources

Update workflow for more sensible yum-plugin-priorities advice
<install> bind_key; preflight checks; docs

* added some preflight sanity checks like "is this RHEL 6?"
* compressed some verbose code defining yum repos
* after some research, discovered that the bind key is not half of a
keypair and can be set arbitrarily; re-enabled that ability.
<install> use 2.0 beta channels from RHN
Merge pull request #111 from sosiouxme/enterprise-2.0

improvements + beta channels
Merge pull request #112 from dobbymoodge/check-sources

<oo-admin-check-sources.py> Bug 1023359, detect disabled RHEL channel and language tweaks