fixed pagination

[Lewke]

If you try to use the IndexAction with the page parameter specified it causes a 500.

I resolved this by properly associating the page parameter in the index action.

Is there a reason to set params manually? If not then that line can be removed, along with the test.

[tuyakhov]

The reason you were getting the error is that the correct query parameter should contain square brackets. That is also why params attribute was used. I improved the pagination handling and add a small note in the documentation to make it more clear.
See #63