Add access token admin view

🧑‍💻 update error response output

Merge pull request #25 from IanSimpson/fix-secret-worng

Secret shown to user is different to the one that gets hashed.

Merge pull request #23 from IanSimpson/hash-client-secret

Hash client passwords.

Merge pull request #22 from halkyon/validate-client

Ensure credentials and redirect URI are given on client identity.

Merge pull request #21 from halkyon/require-client-redirect-uri

Ensure credentials and redirect URI are given on client identity.

Merge pull request #16 from IanSimpson/logger-fixes3

Allow overriding logger from subclasses of OAuthController

Merge pull request #14 from halkyon/add-logger

Add logger, log authorizations to syslog.

Merge pull request #15 from IanSimpson/logger-fixes2

Allow overriding logger from subclasses of OAuthController

Merge pull request #13 from halkyon/fix-logger-auth

Fix logger to output to auth log by default