Request: merge and removeBatch mutators

[lucasveigaf]

Are you submitting a bug report or a feature request?

feature request

What is the current behavior?

If there's a need to insert multiple new items into the array, a loop will be necessary using push or insert, which is not optimal. The same applies for removing multiple items from the array.

What is the expected behavior?

I would like to have a mutator that accepts an array with new items and merges it with the field array. Also, another mutator that accepts an array of indexes to be removed from the field array.