Fixed benchmarks to actually output valid json

before it was just the console.log version of the object, now actually
calling JSON.stringify and logging that
small tweak to name of a benchmark
Update MongoDB dependency to 1.3.17
Merge pull request #1629 from reezer/patch-1

Update MongoDB dependency to 1.3.17
Fixed issue with positional operator on ref'd docs

Positional operator was throwing an error when you tried to update a
referenced document on another doc. fixes #1572
simplify test for 1572, ocd
Limit applies to individual items on population

fixes #1490, the limit is now respected on an item by item basis when
populating an array of items.
refactor 1613 test
update History
Update release-items.md
tests; convert id to string
fixed for different semantics; can now fully overwrite
fixed merge conflict