This improves the internal iteration by up to a factor of 5.

It's still a bit slow, though.
Update to new artifactId cypherdoc->graphgist.
Merge pull request #2285 from chrisvest/2.1-prim-long-int-map-iteration

Speed up the internal iteration of PrimitiveLongIntHashMap
update change logs for 2.1.0-M02
Update change logs for Cypher
Add support for SelectOrSemiApply