Subtle, nuanced and absorbing, Lance Edmands’ directorial debut “Bluebird” is a remarkable first feature and wise beyond his and its years. Carefully shot, well-observed and featuring terrific performances from an excellent slate of experienced, yet largely unknown actors (aside from the “Mad Men” and HBO stars), “Bluebird” is an affecting and moving examination of family, mothers, connectedness and the ripple effect of tragic consequences.