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
underlying library is glib-based library i.e. it uses all its data structures... it cannot work without it... having gchar adds more clarity  for the functions as they are directly used by the library return data structures or something is passed on to the library...