add operators "in" and "between"

[pedroufv]

I've created these two operators to increase search capability.
Use the comma for each parameter as 'period: start_at, end_at' or 'id:1,2,3,4'

[bsormagec]

I am not sure about this, if another requirement about this happens. We can again check this

[pedroufv]

I've add new update to be possible use "in" and "between" on OR condition too on 631bd2e

I think that class need be refactor, splitting the behavior in methods to improve read and mantaine.

I created a Trait to have the same thing as this class: https://github.com/laravelha/support/blob/master/src/Traits/RequestQueryBuildable.php

On this, I separate in methods, but it work into Eloquent