增加了Sails 对SaaS（同库同表）的支持

1 sails config/models.js

add config -> multitenant:true/false

2 modify waterline/core/index.js

blew options(row 25)

> this.multitenant = true;
      if (Object.getPrototypeOf(this).multitenant == false) {
          this.multitenant = false;
      }

blew this._callbacks = schemaUtils.normalizeCallbacks(this);; add

  // if multitenant==true add tenantId
  if(this.multitenant){
      this._attributes.tenantId = {type: 'text'};
  }

others look at commit