GitLab

This can be used to build wheels in a conda enviroment on appveyor.
The tests use a simple package (origsel/python-appveyor-demo) to test
building and testing a wheel

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

Fixed typos

[skip ci]

Allow other build commands to Docker

Thanks to Chad Dombrova for pointing this out

Add openjpeg dependencies to openjpeg build recipe.

Remove openjpeg as dependency for tiff (doesn't appear to be found during tiff
build).

Refactor cmake into own routine.

Disable bzip2 build for OSX.

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.

Wrong indentation causing error in variable definition - see
https://github.com/matthew-brett/manylinux-builds/pull/10#issuecomment-233305951

[skip ci]

BUILD_COMMIT not available directly from the repository, and may be useful for
later build steps.

[skip ci]

[skip ci]

From suggestion by Ralf G.

[skip ci]

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

The thing that sets the Python version for building and testing is the
MB_PYTHON_VERSION variable.

Build / test Python versions conceptual separable in case of Linux
builds.

Thanks to Uwe L. Korn for reminding me.

Useful for scripts overriding "build_wheel" function.

Make function to download and unpack archives.

This allows caching the archives in the `archives` directory, either by
committing to the git repo, or when doing repeated builds of the same
library.