wechat-jssdk

• add MongoStore to store signatures to MongoDB
• initialize tokens and signatures from db to memory for better performence
• Store class extends EventEmitter to make it events noticiable
• move client.js to lib dir, using webpack to transpile the client js

Using ES6 to refactor all APIs

Breaking Changes:

• change all syntax to ES6 style
• create JSSDK, OAuth class to handle jssdk and oauth requests
• create Store class to extract logic to store jssdk signatures, create subclass of Store to add custom store logic
• add simple FileStore extending from Store
• make all store apis promiseble
• add missing jsdoc for apis
• couple other updates and fixes

• client side js refactoring
• remove updateConfig method from wechatObj, use signSignature directly if need to resign the signature
• optimize the wechat script loading logic

• fix redirect_uri hash order, put redirect_uri query before the last query paramater

• fix oauth access token cache
• fix getting oauth callback url api

• change all apis to promise style
• other fixes

• add returnToken option for getUserInfo api to return access_token , refresh_token with other user info
• add getUserInfoByOptions api to support passing options object, instead of passing parameter one by one

• OAuth feature fixes and updates
• add cached OAuth access token
• update OAuth URL config

• fix global token check

• renew url signature upon time expiration(2hs)
• couple of minor fixes

• add client side js to work together with nodejs side
• bugfixes