Access token branch saif

FIles To Review

1..AccessTokenDataBase.cs
2..CustomException.cs
3.IAccessToken.cs
4.TokenAccessService.svc
5.AccessTokenFixture.cs

1. IsTokenValid will only check whether a particular token is present in Db or not and Accordingly it will return bool     status. IsTokenValid will be called for every operation for validating token from MovieService.
2.IsTokenReleased will Removed a valid token from Db and Accordinly it will return bool status.
 .IsTokenReleased will be called only at the time of logout to release token(if valid) from Db.