Merge branch 'lib-upgrades' into 'master'

Third-party library upgrades

* lib: Upgrade php-gettext from 1.0.11 to 1.0.12
* lib: Upgrade accept-to-gettext.php from 2003-08-14 to 2007-04-01
* lib: Upgrade JShrink from 0.5.1 to 1.1.0
* lib: Upgrade mobile-detect from svn r44 (2012-05-03) to 2.8.24 (2016-11-11)
* lib: Upgrade php-publisher from ??? to a5d6a0e (2016-11-15)
* lib: Upgrade php-subscriber from ??? to 1213f89 (2016-11-15)
* lib: Upgrade script.aculo.us from 1.8.3 to 1.9.0
* lib: Upgrade timezones.txt from 2010k/l/m/n/2011a to 2016j

See merge request !40