Renamed function
Better error reporting
Remove RegistrationAccessToken and Configuration Read Endpoint

Add client_secret test
Add test for invalid request body
Updated client mode token request
Merge pull request #46 from ebu/update-register

Implements #40: Update /register
Merge remote-tracking branch 'origin/update-association-endpoint' into update-association-endpoint
Refactored
Merge branch 'update-association-endpoint' into update-association-initdbscript