Added journal field to Westacular's autocomplete

I added journal field to Westacular's autocomplete. Now it is `journal` or, if it is absent, `eprint` (in my field most of papers start as arXiv preprints).

Moreover, I modified the default style so that:

* it has full title and author in the first row (it is the only searchable row!)
* it has title and journal in the second line

I modified it for my own use (for me it is the most convenient), but if you consider it of the general interest, I would be happy to get merged in. :)