Give an indication of number of reports available in each category

![query_count_in_header](https://f.cloud.github.com/assets/1704017/2093573/3858f018-8ebb-11e3-8638-dc924fa887fa.png)

Just a quick change to give an indication of the number of queries in each category.

Not sure of the etiquette on pull requests, but, wanted to send this back because I love this report plugin.  Thanks!