Fix issue #16 Hide 'Groups' if the user does not have permission

Fix https://github.com/cloudspokes/direct-app/issues/16
-add TCStaff check
SecurityGroupsTcStaffOnlyInterceptor is default configured in groupDefaultStack

<package name="securityGroup" namespace="/group" extends="base">
        <default-interceptor-ref name="groupDefaultStack"/>

<interceptor-stack name="groupDefaultStack">
                <interceptor-ref name="baseStack"/>
                <interceptor-ref name="defaultStack"/>
                <interceptor-ref name="authnInterceptor"/>
                <interceptor-ref name="securityGroupsAccessInterceptor"/>
                <interceptor-ref name="securityGroupsTcStaffOnlyInterceptor"/>
</interceptor-stack>