Create a CPAN Monitor

We need to make sure that our CPAN mirror is being updated correctly. The monitor should check to see if the `02packages` file is older than an hour, and if it is, send an alert.

```
$ ls -l /home/cpan/CPAN/modules/02packages.details.txt.gz
-rw-r--r-- 1 cpan cpan 2033333 Jan 16 19:29 /home/cpan/CPAN/modules/02packages.details.txt.gz
```