Revert "Fix curses for supported Ruby versions, including Ruby 1.9.3 ."

The need for this is removed by merged

    https://github.com/ruby/curses/pull/4

This reverts commit 16ead977fa837966736b7dc50b3cfa6a3dd7d3c2.
[#11] Fix bundle exec sidekiq-spy fails on Ruby 2.1.0 .

Upgrade to at least Curses 1.0.1 , which contains

    https://github.com/ruby/curses/pull/4

Hurrah!
Merge branch '11-curses-pre-2.1.0-no-op'