Filter path collections on properties

[ebran]

When navigating paths, allow for filtering nodes/edges on properties. One suggestion for how this may work:

var pc = g
  .navigate("Person", nodeFilter={"name": "Alice"})
  .step("KNOWS", "Person", relFilter={"since": 2012}, nodeFilter={"name": "Bob"})
  .step("KNOWS, "Person", relFilter={"since": 2008}, nodeFilter={"name": "Charlie"})