app-misc/mat: Bump to 0.5.2, add missing dep

Required even without GUI.
restview: Bump to 2.0.4
dev-python/clint: Bump to 0.3.7
enum34: Update to 1.0, new dep for 2.6
fabtools: Bump to 0.18.0, bump fabric dep
vulture: Bump to 0.5
pythonwhois: Bump to 2.1.3
dev-python/natsort: Bump to 3.2.0
dev-python/isort: Bump to 3.8.0