Unit test for JWKSetKeyStore class
updated unit test to fit new nimbus version
Added tests for DefaultJwtEncryptionAndDecryptionService
removed unnecessary unit test
added in better default checks for content negotiation
grants table displays number of access tokens associated with grant (not id or refresh tokens), closes #555
refresh token table displays count of currently active access tokens, closes #554
enhanced client searching, closes #565 closes #566
grouped buttons in admin panel, closes #459
added some header icons