Set up mongo with the mongodb module
Switch from the native Mongo driver to Mongoose

Conflicts:
	package.json
Add an error handling function
Use Model#remove() in the seeds
Use promises with Mongoose to lower the amount of callback hell
Rename db.getFeatures() to db.seed()
Merge db.js into features.js
Start setting up migration code based on the old seeds
Remove the original seed function and access mongodb from features.find()