Some message/docs cleanup and a bugrank.txt validation/alphabetization ant plugin

In early August, I played around with making a new ant plugin that would validate the bugrank.txt and alphabetize it, making it easier to maintain the list of ranks with more accurate values.  After experimenting with it for a few months in my fork, I think it's ready for deployment.

Like the docs say, download from [here](https://bitbucket.org/klubick/bugrankcheckstyle/downloads/bug-rank-check-style-1.0.0.jar) and put it in `~/.ant/lib`