added lombok to simplify pojos
Use WellKnownConfig object in more places

Added the code to support JWE. The decryption service, key generation
and storage was added. Some additional conditions was injected to code
to detect if Id Token is encrypted.
The JWKS endpoint was added for encryption purposes.
The documentation was updated to describe the encryption's classes.

- Validate the ID token via Nimbus
- Show the user info and claims on an HTML page
- Add logout endpoint
- Add Bootstrap styling
- Update docs
- Make jar not war

Added ID token support.

Added ID token validation.

Updated spring OAuth version.

Changed UserInfo to most minimalistic version.

removed .properties (todo: setup config instructions inside the readme).

Adding OAuth2ClientContextFilter to Spring Security Filter chain to catch "UserRedirectRequiredException" and redirect user to Google login page accordingly.