Adapt style for use with jabbrv

I adapted the style to work with the [jabbrv](http://www.compholio.com/latex/jabbrv/) package which automatically abbreviates journal names according to ISO 4 / ISSN standard abbreviation rules. Essentially this patch wraps all journal names in \JournalTitle{} command, which is defined by jabbrv. To not use this patch, one would simply 

    \newcommand\JournalTitle{#1}

This should probably be a new branch in the repo as it should be a choice.