Set the `hideReply` param on front matter to completely remove the "reply
to" link present in the bottom of the pages. This is
backwards-compatible given that any page that does not have the
`hideReply` param will continue to work as before.
Adds a .Site.Params.dateFormat setting to let users specify a Hugo-style
date format string for content. Previously, the date format was
hardcoded to "02 Jan, 2006", presumably to match the original BearBlog
style. This format gets used by default if the new "dateFormat" setting
is absent from the site config.
