experimental branch crazy refactoring
got it all working again after the crazy refactoring
fix response returning, still need to fix dealing with invalid and expired tokens
add license headers to new PHP files
source formatting
fix Client tests
update README a bit already, extend Pimple instead of Silex
more major cleanups
forget license texts
integrate with new guzzle BearerAuth plugin
set redirectUri also for access token request when fetching from authorization code, handle errors at token endpoint