TestHelpers

Hi,
I have added the TestHelpers module which includes methods to stub out the `current_page`, `total_count` and other methods used in the pagination partials, to allow spec-ing the controllers with `render_views`. The code is fairly simple and I have tested with all 4 mocking frameworks supported by RSpec. Also I have asked (and they have already implemented it) extra functionality from rspec-core so that it is possible for my TestHelpers to automatically detect the mocking framework being used and generate the correct stub calls. TestHelpers have been tested with both rspec-core-2.5.1 (without the extra functionality) and with the git version of it (with the extra functionality). 

I don't know if this better sits together with kaminari in the same gem, or I should create a kaminari-rspec gem (tentative name) of my own. As the owner of kaminari, I let the choice to you, and I am fine with both solutions.

regards,
marco