Add contribution guidance

Add CONTRIBUTING.md that points to the same document in chef-cookbooks
Add mention of the contribution document in the top of the README.md
Merge pull request #70 from claco/contributing

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ha clustering set from rabbitmq settings and clean up jcannava's bare tabs
Merge pull request #72 from rackerjoe/master

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Filter out Cinder VG from LVM

Without filtering out the cinder-volumes VG, LVM will happily
scan and import VGs defined on any block devices within /dev.

This commit adds a filter rule in /etc/lvm/lvm.conf which rejects
devices which match node['cinder']['storage']['lvm']['volume_group'].

Fixes DE253
Merge pull request #73 from DavidWittman/lvm-filter

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Remove volume_pool_size cinder.conf configuration option

The correct configuration option is pool_size, however this is only used when
using a volume_driver of cinder.volume.drivers.lvm.ThinLVMVolumeDriver, which
we don't support.  We can re-add pool_size if we do decide to support
cinder.volume.drivers.lvm.ThinLVMVolumeDriver.
Merge pull request #75 from mattt416/remove_pool_size_config_option

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Updating version # to 4.1.2