数据层框架（baas、sync、datastore）整理

## parse

https://parse.com/
## dropbox Datastore API (A-C2S)

https://www.dropbox.com/developers-v1/datastore/docs/js
## firebase

https://www.firebase.com/
## meteor minimongo + ddp

https://www.meteor.com/full-stack-db-drivers
## js-data

http://www.js-data.io
## ember-data
## deployd

http://deployd.com/
## gunjs （A-P2P）

https://github.com/6174/gun
## relay + graphql
## pouchdb

https://github.com/pouchdb/pouchdb
## amazon-cognito-js

https://github.com/aws/amazon-cognito-js

@todo: 详情

The issue lists several data-layer frameworks and services but does not specify what to do with them. Start by exploring the repository structure to see if there is a documentation section or a README that needs updating. Look for existing files that mention these technologies to understand the context. The task likely involves summarizing or comparing these frameworks, but the exact deliverable is not defined.

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