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Previous version was using a sub-shell to execute, and therefore not
catching errors during execution of the functions that had errors, but
did not return non-0 exit codes.

Add tests.

See: https://github.com/pypa/manylinux/issues/160

It appears that is_function actually
calls the function (debugged). Why
that happens is a mystery to me, but
this should ensure that the spinner
runs as it is supposed to rather than
waiting until pre_build is complete.

See https://github.com/travis-ci/travis-ci/issues/8703#issuecomment-348866918

It appears that is_function actually
calls the function (debugged). Why
that happens is a mystery to me, but
this should ensure that the spinner
runs as it is supposed to rather than
waiting until pre_build is complete.

See https://github.com/travis-ci/travis-ci/issues/8703#issuecomment-348866918

Fix "cd" overridden by RVM.
Don't try to uninstall virtualenv if pip is not installed.

Add tests for fill of pypy versions, give full versions for latest.

This changes how the the Python implementation is selected.  It's now
primarily based on enviroment variables.

Uses the PYPY_VERSION enviroment variable to determine the version of PyPy to
install.  An example has been added to the matrix in the readme.

Dashes were missing from untar on MacOS.

Redirect fill_pyver errors to stderr, instead of returning them as the
result.

pip will copy the directory it installs from before running the install
/ wheel build.  If the directory is a submodule, then the copy breaks
the connection with the containing project, so git commands to get the
version will fail.

Fix is to re-create the .git directory for submodules.

Version of fix in https://github.com/matthew-brett/multibuild/pull/12
with thanks to Hassan Kibirige.

* https://github.com/direnv/direnv/issues/210
* https://github.com/travis-ci/travis-ci/issues/6522

[skip ci]

library_builders.sh script in fact needs common_utils.sh.  Source that
script, and put a guard in common_utils.sh to prevent it being sourced
more than once.

For getting versions from versions with suffixes.

Always load library builders (for OSX as well as Manylinux).