HTTPS (and canonicalize domain) for github.com

HTTPS (and canonicalize domain) for github.com

All links to www.github.com were changed to github.com (preferred by GitHub).

During the automated testing of all modified packages the following SRC_URIs
were discovered to have changed upstream. Upon closer inspection they were
all confirmed to not be regressions. They will all continue to work when
served from the mirrors.

* dev-python/catkin_pkg-0.2.10 (upstream tarball changed)
* dev-python/rosdistro-0.4.4 (upstream tarball changed)
* dev-util/rosdep-0.11.4 (upstream tarball changed)
* dev-util/wstool-0.1.12 (upstream tarball changed)
* dev-util/wstool-0.1.13 (upstream tarball changed)
* dev-util/rosdep-0.11.5 (upstream tarball deleted)