title: Sequelize select * where attribute is NOT x
body: <p>looking at the <a href="http://docs.sequelizejs.com/class/lib/model.js~Model.html#static-method-findAll" rel="noreferrer">docs</a> you can use 
      <code>model.findAll({where: {attribute: x}})</code>. However, I want to select all attributes that are simply NOT x. I was looking into a regular expression here but that seemed like not an optimal solution. </p>
  
  <p>What is the best way to do this?</p>