Set new version in master.
Makes sure no traces of the index config is left behind if acquiring an
index resulted in its configuration to be created, but with an invalid
configuration.
Make Cypher execution results closable

o Introduces ResourceIterable/ResourceIterator
o Makes ExecutionResult implement ResourceIterable
Merge pull request #833 from systay/closable-execution-result

Make Cypher execution results closable
Merge remote-tracking branch 'upstream/master' into 2.0