Use insert instead of upsert

It is not allowed to update documents in system.indexes, which means
that index creation would fail.
Make sure the property order is ignored

When creating an index by inserting it in system.indexes an _id
property is added by the node.js driver - with the consequence that
the resulting oplog entry would not be found.
Sync all collections in integration tests
Add tests for index creation and deletion
v0.9.1