New PostStatusBuilder DSO

Returns an object with #status and #pubdate_str methods, where #status
is either :public or :draft, and where #pubdate_str returns a formatted
timestamp for a :public post, or a 'DRAFT &hellip; Unpublished' string
for a :draft. Next up: integration.

RSpec: 728 examples, 0 failures (but see Issue #87)
RuboCop: 153 files inspected, no offenses detected