Update mystic-river dataset

[whatSocks]

mystic-river should be able to handle the following queries:

MATCH (kevin:Person)
WHERE kevin.name = "Kevin Bacon"
WITH  kevin
MERGE (kevin)-[r:ACTED_IN {roles:["Sean"]}]->(movie:Movie {title: "Mystic River", released:1993})
RETURN movie,r, kevin

MATCH (m:Movie)
WHERE m.title = "Mystic River"
SET m.tagline = "We bury our sins here, Dave. We wash them clean."
RETURN m.title AS title, m.tagline AS tagline

MATCH (m:Movie)
WHERE m.title = "Mystic River"
SET m.released = 2003
RETURN m.title AS title, m.released AS released

MATCH (kevin)-[r:ACTED_IN]->(mystic)
WHERE kevin.name="Kevin Bacon"
AND mystic.title="Mystic River"
SET r.roles = ["Sean Devine"]
RETURN r