Support :eq(NUMBER) pseudoselector

[cibernox]

Another pseudoselector in jQuery that is pretty useful is the :eq(N). It returns the Nth occurence of a selector in the dom.

For some usages like assert.equal($('.user:eq(2)').text().trim(), 'James') it can be easily replaced by assert.equal(findAll('.user')[2].textContent.trim(), 'James').

However, this doesn't work for selectors like click('.profile-link:eq(2)').

An scape valve would be to allow helpers to receive HTMLElements instead of selectors, and do click(findAll('.profile-link')[0]).
That is my next issue.

[cibernox]

Superseded by #32