static loadModels() {

    let dir = './app/models';
    if (!fs.existsSync(dir)) {
      return [];
    }

    return fs
      .readdirSync(dir)
      .filter(filename => filename.indexOf('.') !== 0)
      .map(filename => require(`${process.cwd()}/app/models/${filename}`))

  }
Loads all model constructors in your ./app/models directory into an array
@return {Array} Array of model Constructors