Added sample bibliography and bibliography stylesheet

A sample bibliography "bib" file and a bibliography stylesheet that
removes DOI and URL information from most citations with exception to
miscellaneous/Internet entries.
Support for Libertine sans-serif font added. Extra check for Garamond font

Libertine sans-serif font added to list of supported fonts. Libertine
can be enabled by adding "libertine" to the documentclass options
within the LaTeX document.

Mathdesign package now classifies Garamond as a non-free font and is
not included in standard release. A check for the necessary package is
made before attempting to change to Garamond.
Line number support added

Line numbers can now be added to each page by adding "lineno" to the
documentclass options.

Changed \startpreamble macro to \newcommand.
Support for author-year added

Citations are currently numerical by default. This can be switched to
author-year mode by declaring authoryear as an option within the
documentclass.
Dedications are now optional

Dedications are now optional. By specifying a dedication using the
\dedication macro, a new page is created with the dedication and is
proceeded with a blank page. Not specifying a dedication moves directly
to the end of preamble rather than adding further blank pages.