fixing bugs in last and removing debug prints.
Merge branch 'aql2' of ssh://github.com/triAGENS/ArangoDB into aql2
Merge branch 'aql2' of ssh://github.com/triAGENS/ArangoDB into aql2
skiplists in IndexRangeBlock working.
Merge branch 'aql2' of ssh://github.com/triAGENS/ArangoDB into aql2