Update README

Update links to point from Cloudsmith to Puppetlabs.
Update PE 3.0 definition
Merge pull request #1 from laurenrother/patch-1

Update README
Add Contributing.md

Add Puppet Labs general Contributing guidelines.
Merge pull request #3 from laurenrother/documentation

Add Contributing.md
Merge branch 'dev' into forge-v3-api
Refactor Forge API services into interface/implementation split
Make versions use flyweight pattern
Using fromString/create static methods for creating ModuleName