More consistency checking for relationship group records

Added the following checks:
o RelationshipGroupRecord has invalid rel type id
o RelationshipGroupRecord has invalid next pointer
o RelationshipGroupRecord chain is unsorted
o RelationshipGroupRecord refers to relationship that is not in use
o RelationshipGroupRecord refers to relationship that is not first in its
  chain
o RelationshipGroupRecord refers to relationship that is of a different
  relationship type than its group
Remove the old query to make the Cypher csv example work again.
Setting correct parent pom for cypher docs.
Merge pull request #2035 from tinwelint/2.1-cc-relgroups

More consistency checking for relationship group records
HOME is now set in the build configuration/ machine itself
Tie USING PERIODIC COMMIT to LOAD CSV
Ignore doc tests for PeriodicCommit until we get the doc update in
Remove links to the periodic commit reference
Merge pull request #2100 from jakub-/tie-periodic-commit-load-csv

Tie USING PERIODIC COMMIT to LOAD CSV
Depend on exact version of karma
Fix versions of npm development dependencies.
Update documentation around LOAD CSV and PERIODIC COMMIT