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
No, those getter should use inline to avoid the the function overhead. Compiler will default build the functions with impl in .h as inline. That is why I suggest you move the getter impl into .h before.