v3.1.0

This release of GSP finally adds comments.  Comments are very simple and
are defined as any node of the name ‘/’.  This allows you to very easily
comment out entire sub-trees of your page by simply writing a slash and
a space.  The following example shows how you might comment-out the
entire body of your page:

    html lang="en" {
      / body {
        p {- Hello, World!}
      }
    }

Additionally in this release is support for long-options.  Along with
the ‘-d’ flag you may now use the long-option ‘--no-doctype’.
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