Upgrade to mongodb ~3.x lib

[etsuo]

We're currently on the 2.x series and 3.x has breaking changes, so it'll take a little bit of work.

[etsuo]

v3 was just released, so still waiting on types:

• [mongodb] First update to bring the mongodb to version 3 DefinitelyTyped/DefinitelyTyped#22626
• @types/mongodb v3 DefinitelyTyped/DefinitelyTyped#22538

Note that it looks like MongoClient.connect has changed it behavior:

• http://mongodb.github.io/node-mongodb-native/3.0/api/MongoClient.html#.connect
• http://mongodb.github.io/node-mongodb-native/2.0/api/MongoClient.html#.connect

This will break SakuraApi's implementation - see src/core/sakura-mongo-db-connection.ts:connect.

This will express itself as a break in getCollection @Model injected method.

[stevenschobert]

👋 Here!

[etsuo]

Thanks for the contribution @stevenschobert!