Protect fragile parbox in demothesis author field
On some older versions of LaTeX, an error occurs when trying to use a "\parbox" within the author field of the demothesis:
! Argument of \reserved@a has an extra }.
For example, the error occurs on Ubuntu 14.04 LTS when using the LaTeX packages available in default repositories (i.e. TeX Live 2013/Debian). It doesn't seem to occur on Ubuntu 16.04 LTS (TeX Live 2015/Debian).
For more information about this kind of error, do a web search for: Use of fragile command in a moving argument