Static methods are automatically bound with the context of their Model.

[DanielBoa]

This change automatically binds any applied static methods with the Model as the context. This is useful when passing a static method as a reference (for example to an array method).

e.g.

const userSchema = new Schema({ ... });

userSchema.statics.getById = function getUserById(id) {
  return this.queryOne('id').eq(id).exec();         
};

const User = dynamoose.model('User', userSchema);
const userIds = ['xxxx', 'yyyy'];
const users = await Promise.all(userIds.map(User.getById));

[coveralls]

Coverage remained the same at 82.495% when pulling 60d9497 on DanielBoa:master into 310da5c on automategreen:master.

[fishcharlie]

LGTM

[fishcharlie]

@DanielBoa Thanks for this! We'll get this in for version 0.9.