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
you're introduing glib.h only because you use `gchar*` in this header. Please consider use `char*` instead. If you agree, please do that thing in all places of this PR.