これを試してください:
public static ISessionFactory CreateSessionFactory()
{
string connectionString = ConfigurationManager.ConnectionStrings["PostgreConnectionString"].ConnectionString;
IPersistenceConfigurer config = PostgreSQLConfiguration.PostgreSQL82.ConnectionString(connectionString);
FluentConfiguration configuration = Fluently
.Configure()
.Database(config)
.Mappings(m =>
m.FluentMappings.Add(typeof(ResourceMap))
.Add(typeof(TaskMap))
.Add(typeof(PluginMap)));
configuration.ExposeConfiguration(x => x.SetProperty("hbm2ddl.keywords", "auto-quote"));
return configuration.BuildSessionFactory();
}