apache_requests_per_second.c counts lines from Apache's access_log each second and sends that count to Graphite.

- This is my first real bit of C code. It's terrible.
- This is a very naive implementation for reading/counting the number of lines in a log file each second.
- It has a few flaws:
 - It doesn't handle logrotate scenarios.
 - It typically takes 0.015s to run, then sleeps for 1 second. This means the interval between reads is really 1.015s. This occassionally leads to skipped seconds and spikes in the Graphite graph that make it look (falsely) like there was more volume. In reality, it's because the lapsed a second.