Merge pull request #697 from jdtoy/semversioning

0.5 docs: about semantic versioning.
Merge pull request #701 from jdtoy/0.5-verification-plus

0.5. Docs: Verification ++
Fixed minor sudu -> sudo typo

Conflicts:
	docs/start/known-issues.md -- combined 2 separate issues
Add Getting Started to the Top Menu.
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"
Updates to Examples Before you Begin and Simple Web server to improve path from Getting Started.
SSH Keys: Mention no password.

Conflicts:

	docs/use/guide/quickstart/index.md
Correcting bad cherry pick merge.