Different memory info format

I saw issue #3 and appreciate that you put back the mention of the older format of 'free'.

However, I'm stuck using a system with the older format, and actually showing it on the web page, as it was in the first version of the site, is really helpful!

Could you please bring back the "-/+ buffers/cache:" version?  It'll help those who are stuck with older versions of Linux.

Thanks!