Simplify installation instructions
Merge pull request #21 from AlexStansfield/develop

Move finding of scopes into scope manager
Merge pull request #25 from relaxnow/patch-1

Simplify installation instructions
fixes getScope return type - was an array but needs to be a string
Update README.md

Provides links to the official documentation of the oauth2-server-php library for those who arrive at the bundle first.
Update README.md

Fixes broken link
makes dependencies more flexible