Added option to get stats returned when running a cypher query.

Signed-off-by: Oskar Hane <oh@oskarhane.com>
Changed order of function arguments so callback is last, and added checks to see which argument is the callback.

Signed-off-by: Oskar Hane <oh@oskarhane.com>
Merge pull request #31 from oskarhane/return-stats-from-cypher-query

Added option to get stats returned when running a cypher query.
Thanks a lot @oskarhane.