An array of CSS selectors that is replaced whenever a matching element is found in a response.
These elements are replaced even when they were not targeted directly.
By default this contains the [up-hungry] attribute.
The configured selectors will be used to find hungry elements in the current page.
For each matching element a target will be derived from that
specific element. E.g. when you configure up.radio.config.hungrySelectors.push('input'),
a given input will be targeted with its derived selector (like input[name=email]).
For this to work hungry elements must have a derivable target selector.
