Convert database adapters to support promises.

[ekryski]

I'm not sure whether we should kill callbacks altogether but we should definitely support promises. We could potentially use native promises (since node is now v4+) or we could use bluebird. I'm leaning a bit more towards bluebird.

Database adapters needing converting:

• mongoose
• knex
• waterline
• sequelize
• nedb
• memory
• mongodb

This should probably also be done at the same time as #125.

[daffl]

Reference implementation is being worked on at https://github.com/feathersjs/feathers-memory/tree/es6. With the bugfixes in latest Uberproto and Rubberduck it should be fully compatible with Feathers 1.x while supporting ES6 syntax, Promises and pagination.

[ekryski]

👍 Looks like you're using native promises. Totally cool with that as it's less overhead. I'm not sure how Babel translates that, but @daffl do you think this will this have any backwards compatibility issues?

[daffl]

I thought it inlines the polyfills but apparently you need to add https://babeljs.io/docs/usage/polyfill/ as a dependency.

[daffl]

This is also being tracked in #170

[lock]

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