Revising README and Contributors Guidedlines

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I was reading Open Source Guilt by Nick Quaranto and decided we need a cleaner readme with better explanations for contributing. Here's that article http://37signals.com/svn/posts/3349-open-source-guilt-passion

Great Example of Contributing Guidelines
https://github.com/puppetlabs/puppet/blob/master/CONTRIBUTING.md

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Donezo! 👊 👨