Significant upgrade to Brooklyn's Readme.
Removed Brooklyn version, as is rendered on github.com.
Will add better 'What' section later.
Added What:Brooklyn, removed Versioning, simplified licence, & other small tweaks.
Updates to wording of Deployment section.
Typo: "logic groupings" -> "logical groupings"
Merge pull request #667 from jdtoy/brooklyn-readme

Updated README.