ensured reIndex results persist across close/open #982

Resolves #982 for non-partitioned collections but partitioned collections
still need to be fixed.
added test for the non-partitioned case #982
fixed reIndex for partitioned collections as well #982
cleaned up bad system.namespaces entries from partitioned collections #967
Merge pull request #995 from Tokutek/persist-reindex

fixed reIndex and system.namespaces entries for partitioned collections

fixes #967
fixes #982