GitLab

Libraries: add SWIG and suitesparse

MRG: enable use of ccache

Enable use of ccache with environment variable toggle.

Updating outdated link to Cython wiki.

MRG: OSX: never update homebrew

Workaround for travis-ci/travis-ci#8552 .  Also see 
https://github.com/fonttools/fonttools/issues/1068

build_simple did not install correctly

Merge branch 'master' into 'devel'

MRG: Updated Python versions

Old SWIG cannot compile on Python 3.

MRG: Changed openjpeg archive prefix for versions newer than 2.1.0

This is a better place IMHO because it parallels where it's set up in docker.

This installs ccache from homebrew, activates it, and verfies its operation.

Link the docker ccache directory to the VM; install and verify that ccache is operating correctly