Revert "Merge pull request #111 from cloudfoundry/fix_events_pagination"

This reverts commit c8811691ca2ed64a46f3ef62438bfbbd2ea99167, reversing
changes made to 62e32be46aab3e95b3499a1ee67c9375889b030a.

The original PR was intended to escape the next_url on events so the
cfoundry gem wouldn't need to perform URL escaping on it, however it
was decided cfoundry shouldn't trust its input and should escape the
next_url itself.