Update from rpp to count to control the number of results

The original is using the depreciated `rpp` parameter, which was making the results always kick back at ~50.  This simple change, in accordance with v1.1 of the Twitter API, updates the parameter to `count` so that you can actually control the number of results.

Supporting documentation on `count`:
https://dev.twitter.com/docs/api/1.1/get/search/tweets#api-param-search_count

Old documentation on `rpp`:
https://dev.twitter.com/docs/api/1/get/search#api-param-search_rpp