exiftool: call without `-D` to get the expected JSON output that we parse

see doc: <http://www.sno.phy.queensu.ca/~phil/exiftool/exiftool_pod.html#options>
css: icons: match our icons as well as generic font-awesome

(also some sass cleanup)
Also update text-search fields of user when person is updated
Fix copyrights uuid migration; added feature scenario for copyrights

..‥ to exercise selection of copyright children

Squashed commit of the following:

commit f3f9b3a2d2940260a56e1b00b88e427ae0811fe2
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Mar 5 14:38:09 2014 +0100

    Added feature test for selecting a child of a license

commit 895e1dbae3a2ec33e895226e777bcc852f7804ae
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Mar 5 14:08:23 2014 +0100

    Fix copyrights uuid migration