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 #50 from claco/contributing

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Check for missing server_id node attribute.
Merge pull request #51 from git-harry/master

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Fix replication issues

* Fixes Issue #527 more correctly
* Fixes replication password
* Removes unused variables
* Removes developer mode since generated passwords are easily accessible
Merge pull request #52 from Apsu/issue527

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more ha work
Merge pull request #54 from rackerjoe/ha_rabbit_part3

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version bump
Version Bump to 4.1.3
Merge pull request #55 from rackerjoe/master

Version Bump to 4.1.3
move version out of metadata.rb into VERSION
Merge pull request #56 from rackerjoe/master

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Fixes MySQL issue 575 https://github.com/rcbops/chef-cookbooks/issues/575
adding platform options
fixing mysql_service name
Merge pull request #57 from jcannava/DE575

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make ['mysql']['tunable']['skip-name-resolve'] = true a default value
Merge pull request #58 from rackerjoe/master

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make ['mysql']['tunable']['skip-name-resolve'] = true a default value