Implementation of Tizen SSO APIs

Implementation of SSO APIs as per widl file https://code.google.com/p/accounts-sso/source/browse/widl/signon.widl?repo=libgsignon-glib

Backend that provides core functionality is gSSO and more information about that
component could be found at https://01.org/gsso
I do not suggest you add getter arbitrarily, if the member used in the class internally, no need to expose for other classes. My point is the members should private instead of public, if need access from other class, then getter is needed.