Update mongodb to version 2.2.25 🚀

[greenkeeperio-bot]

Hello lovely humans,

mongodb just published its new version 2.2.25.

State	Update 🚀
Dependency	mongodb
New version	2.2.25
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of mongodb.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

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The new version differs by 25 commits .

• 915d5c8 Updated version and history to 2.2.25
• e393123 Fixed aggregation test so it does not run against mongodb < 2.6
• a53fd2c Moved generator based aggregation test to generator_based_tests.js
• 6e8de4d Merge branch '2.2' of github.com:mongodb/node-mongodb-native into 2.2
• a0e70e4 test fix for travis
• a57ab85 Merge pull request #1494 from vkarpov15/patch-2
• 0bfde22 NODE-957 Added cursor test that shows cursor closed when batchSize < 0
• 6ef70b8 fix: don't rely on global toString() for checking if object
• 791728e NODE-954 Remove write concern from reindex helper as it will not be supported in 3.6
• 8ec9bf5 NODE-953 Made batchSize issue general at cursor level
• 7e6ccb2 Merge pull request #1491 from mbroadst/NODE-953
• 3465090 Merge pull request #1490 from Annoraaq/patch-3
• b5c188b fix(collection): pass batchSize to AggregationCursor
• 1bdbac2 Changed wrong return type in documentation
• 3230385 NODE-950 modified the index generation as suggested by Matt

There are 25 commits in total. See the full diff.

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