SERVER-12109 projection stage should try to work child even if child is EOF
SERVER-8391 mongoadmin initial commit

create the tool with --upgradeCheck flag which currently ensures all collections that should have an _id index do in fact have an _id index
SERVER-8391 mongoadmin_options_test added
SERVER-12519 renamed admin hints to index filters
multiversion setup improvements
SERVER-8569: Add jstests for SERVER_7451
Merge remote-tracking branch 'upstream/master'