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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.

Python 2.6 installer has 10.3 suffix.

Thanks to Moritz E. Beber for prompting me to formalize this.

MRG: echo status in repair_wheelhouse, avoid 10m limit

See:
https://github.com/matthew-brett/multibuild/issues/24#issue-221951587

MRG: Add PyPy support for Mac OSX builds

Add ability to specify pypy binaries to test against.

Functions renamed to match their intent better.