Include ag-auth-data.h in accounts-glib.h
Include ag-auth-data.h in accounts-glib.h

Fixes http://code.google.com/p/accounts-sso/issues/detail?id=136

plotters/accounts-sso.libaccounts-glib,plotters/accounts-sso.libaccounts-glib,plotters/accounts-sso.libaccounts-glib