Revert "junit test added for signing service."

This reverts commit 9f89f84da14eaa17dc0ee2c3bf4ae966162dfb6a.
Revert "removed the plain verifer. validating a no-signature is simply handled as a special case in validateSignature(). Also, doing some type safety checks."

This reverts commit c957d59f7c3453dbb1ed3268b5bc3320b0294f46.
Revert "implemented alg:none at the signing service."

This reverts commit 02078ebccb8d177353a1d7731188172dc496db1d.
Revert "placeholder"

This reverts commit d763a954da5e13d42851ba0e085cdf8f0e710ce3.
Revert "refactored code to use the more generic JWT declaration."

This reverts commit e0b56bc72a42ae073020af428ea3c58bffbdd5ad.
Revert "PlainSigner and PlainVerifier created for alg:none JWS support."

This reverts commit 30d7aaa66acb4f1eb533d85371ce9d7c83c9aa11.