Introduced AuthService.
Introduced User.
Introduced RoleTypes.
Introduced UserRole.
Removed UserRole, but instead, introduced the Roles property.
Changed FindUserRolesAsync to FindUserAsync.
Removed unnecessary UserRoles.
Renamed RoleTypes to Roles.
Addressed flag enum values of Roles.
Addressed code-analysis errors.
Introduced IUserRepository.
Addressed style-cop error(SA1204).
Introduced AuthService.
Intrduced the Users property.
Implemented FindUserAsync.
Addressed fail test.
Introduced the Owned property.
Implemented this Dispose method.
Merge pull request #11 from jwChung/auth-service

Auth service