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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

Here, we pass both the USE_CCACHE variable and the CCACHE volume to docker.

Use proper activate sourcing for virtualenv

Updated Python versions

* devel:
  Only run builds for subset of matrix
  Build libraries at given build prefix
  Correct openssl hash
  Update openssl version, add test
  Add Python 2.6 virtualenv test

MRG: Fix typo in error message of osx_utils

Fixed typo in spelling

This reverts commit 4e3515d8.