Sync Mk with ports
Prune 2 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  www/rubygem-puma16
  x11-toolkits/gnome-desktop-sharp20
Import devel/p5-Data-Munge version 0.08
Update devel/p5-DateTime-TimeZone to version 1.75
Update shells/bash to version 4.3.28
Update security/gnutls to version 3.2.18
Update graphics/osg to version 3.2.1
Update devel/p5-Return-MultiLevel to version 0.04_1
Tweak net/gssdp version 0.14.10
Update x11-toolkits/gnome-sharp20 to version 2.24.2_4
Update devel/mercurial to version 3.1.2
Tweak math/py-matplotlib version 1.4.0
Tweak net/gupnp version 0.20.12_1
Tweak devel/p5-POE-Component-Schedule version 0.95
Update www/p5-Dancer2 to version 0.150000_1
Import devel/py-jedi version 0.8.1
Update www/rt42 to version 4.2.8
Update graphics/vips to version 7.40.10
Update devel/ipython to version 2.3.0
Update net-mgmt/unifi3 to version 3.2.5