[aur-general] AUR upgraded to 2.3.1

The official Arch Linux AUR setup has been upgraded to 2.3.1. It includes fixes to the typeahead plugin. For a short list of changes, read [1]. Please report any issues to the AUR bug tracker [2]. [1] https://mailman.archlinux.org/pipermail/aur-dev/2014-January/002614.html [2] https://bugs.archlinux.org/index.php?project=2