Change MySQL search mode to 'boolean'
Change MySQL search mode to 'boolean'

At the moment, MySQL searches in natural languague mode. This means
users can't use common search operators, like `""`, `+` and `-`, and as
a result they can't filter results as much as they'd like. This patch
should make that better filtering possible.

Change-Id: I4ae316d13b0478839a97d430632a7bd26d7e40a9

ColdrickSotK/storyboard,ColdrickSotK/storyboard,ColdrickSotK/storyboard