Fix #48: Update file time stamps for emacs

Update all the time stamps in the file to be automatically updated via emacs. This entails adding a file-local variable specification for time-stamp-pattern in each file. This also means adding (add-hook 'write-file-hooks 'time-stamp) to your emacs init file to enable updating the time stamp when the file is written.

We didn't update the individual news files because they haven't really been updated and won't be since these are old news that shouldn't be updated.