Add cfchecker, cdat-lite, and udunits.

:unamused:
```
wget ftp://ftp.unidata.ucar.edu/pub/udunits/udunits-2.2.14.tar.gz
--2014-07-03 16:21:56--  ftp://ftp.unidata.ucar.edu/pub/udunits/udunits-2.2.14.tar.gz
Proxy request sent, awaiting response... 404 Not Found
2014-07-03 16:21:57 ERROR 404: Not Found.
```

This is through a proxy, so it might be a configuration issue on my end...