Initial commit
- Upgraded to latest version of IdentityServer
- Added RefreshTokenStore
- Refactored all token stores to a more generic implementation
- Extracted token expiry collector to its own class
Merge branch 'master' of https://github.com/fruffin/Thinktecture.IdentityServer.v3.EntityFramework

Conflicts:
	.gitignore
	LICENSE
	README.md