Add the call to "require" for "nxml-mode" package before calling "load-theme"

If the "nxml-mode" package is "require"d after the call the
"load-theme" then the XML buffers wont be syntax highlighted

Tip retrieved from the following Emacswiki page:
http://www.emacswiki.org/emacs/NxmlMode

> ’Note’ the colorization (font-lock) won’t work if you change the emacs colors.