quote and quotation environments; tidying; future-readying

- Redefined spacing around "quote" and "quotation" environments to
comply with MLA style

- Shifted workings of Works Cited header to approach what Biblatex
expects

- Added preliminary hooks for supporting the LaTeX standard \maketitle
command instead of relying on an MLA13.sty specific \makeheader command
whose duty is roughly the same thing.