Add disjunctiveNumericRefinements

[JanPetr]

Currently there is no way how to add disjunctive numeric refinements so it need to be bypassed by something like:

helper.setQueryParameter('filters', 'price = -1 OR expires >= 50');

And in the time when helper starts to use filters query parameter the code might break.

Customer's issue: http://stackoverflow.com/questions/40977909/algolia-how-do-i-add-is-it-possible-to-add-a-numeric-disjunctive-refinement/40979372

[seafoox]

Definitely something we need 👍

[Jerska]

Had the case just today 👍 Or at least to plan migrating to filters as a breaking change of the helper.

[Haroenv]

Something we needed yesterday too for date ranges (in the end it worked with AND as well, but would still be nice), cc @samouss

[Haroenv]

Just had another use case for this