Add code to automate keeping ./hosts up to date with someonewhocares.org:
  1. do-update: executes stages (a, c, d) to update ./hosts in `dist` branch if necessary
     (a) do-check-rss-date: which calls (b)
     (c) do-check-shortlog: check date not already applied
     (d) do-download-hosts: perform download
  2. (b) get-rss-age.lua: Lua script to get first date in RSS data from stdin
Reorganised do-update scripts to make them easier to debug and apply in parts
$commitmsg
fetch update of Tue, 05 Feb 2013 21:29:41 PST from http://someonewhocares.org/hosts/hosts
fix assignment of commitmsg
Change url of rssfeed
fetch update of 16 Sep 2011 from http://someonewhocares.org/hosts/hosts
fix use of $commitmsg in do-update
Merge dist into master