Add reject filter

[andershagbard]

This filter adds the inverse of the where filter.

This filter also allows deep searching with dot notation.

Idea from: https://github.com/Shopify/liquid/issues/1555

[andershagbard]

Not sure why Rubocop is failing 🤷🏻‍♂️

[bakura10]

I’m not a ruby developer but it seems you also added a nice feature on the reject filter allowing to filter nested objects. This should most likely be backported to the where filter as well.

[andershagbard]

I’m not a ruby developer but it seems you also added a nice feature on the reject filter allowing to filter nested objects. This should most likely be backported to the where filter as well.

That has proven a bit harder, as there is some backward compatibility we need to take care of: https://github.com/Shopify/liquid/pull/1436