\maketitle still needs to set a page style

Signed-off-by: Thomas Hodgson <thomas.hodgson@gmail.com>
Use polyglossia.sty with xelatex

Signed-off-by: Thomas Hodgson <thomas.hodgson@gmail.com>
Removed mathastext.sty and replaced xltxtra.sty with fontspec.sty
(This means that I can use the latest version.)

Signed-off-by: Thomas Hodgson <thomas.hodgson@gmail.com>