oc_erchef 0.27.3 - fix meck dependency locking
Updated chef-server-ctl commands to use add_command_under_category.

This will make help output much more readable, grouping all the commands under logical categories.
Updated changelog for omnibus-ctl 0.3.0.
Merge pull request #486 from opscode/tc/update-ctl-help

Added category arg to all add_command uses.
Changed flavor from 'ec' to 'cs' (chef server)
Merge branch 'dt/the-flavor'
Update changelog with oc_erchef 0.27.3 info.
Updated changelog with...  Changes
Added Contribution section to the readme.
Merge pull request #503 from opscode/tc/link-in-contribution

Added Contribution section to the readme.
Add note about chef_max_version bump to 12 to changelog; release notes
Merge branch 'mm/add-version-bump-to-changelog'
erchef version bump
oc_erchef to 27.4; update changelog notes; ldap configuration updates