Payment methods should be scoped to available.
Bump to Rails 4.0.8
Added without_children = true in taxon autocomplete API Call

We do not need taxon children in autocomplete of product taxons. As we were loading taxon children the response of the API call was slow.

Fixes #4903
Optimize available_countries

Use .sort_by so that we only run .parameterize once per country.

Fixes #4899