Decoupling vue-mc from RESTful APIs about vue-mc

[Skuudoer]

@shepheb,

I've done it via extending the model

import { fetch, save, remove } from './adapters/PouchDB'

...

export default class BaseModel extends Model {

...

 /**
   * Overide parent's @fetch method to retrive data from the database 
   *fetch
   * @param {*} document
   * @memberof BaseModel
   */
  fetch(document) {
    // call fetch from PouchDB
    fetch.call(this, document)
  }

...


  /**
   *Overide parent's @onFetchSuccess handler to retrive data from the database
   *onFetchSuccess
   * @param {*} snapshot
   * @returns document
   * @memberof BaseModel
   */
  onFetchSuccess(snapshot) {
    return snapshot;
  }