Fix centering on multi-line committee member.

[clpetix]

Currently if a committee member becomes multiline, the second line is slightly off-center. I was able to get around this with the following changes:

\newcommand{\committeemember}[1]{%
    \par\noindent
    \makebox[\textwidth][c]{%
        \begin{minipage}{6.5in}
            \centering
            #1\par
        \end{minipage}%
    }%
    \par
}

and

Approved by\par
    \vspace{0.75\baselineskip}
        \begingroup
            \setlength{\parskip}{3pt}
            \@committee
        \endgroup

[mphoward]

Thanks! I fixed this in #12 by switching to a lower-level list and using a \parbox.