• Add $build_dir and $target_dir variables for target scripts (thanks @marshall!)
• bugfix: ensure the script environment is available when running scripts for the top-level module

This is my last release as the maintainer of yotta at ARM (I'm leaving ARM to work on other things).

The future maintenance of yotta at ARM hasn't been resolved yet, but @0xc0170 and @jaustin are both co-owners of the PyPI project, and @thegecko is looking after the yotta registry and website.

• add more useful error message, and suppress back-trace, for errors caused by expired JSON web tokens (such errors are most likely caused by an inaccurate clock). Alleviates #669

Thanks to @ccli8 for reporting.

setuptools 20.6.6 (published this morning) causes a failure when resolving the dependencies of requests[security] (e.g. python -c "import pkg_resources; pkg_resources.require('requests[security]')"), which yotta does indirectly.

This release includes a workaround so that yotta no longer relies on pkg_resources to determine its own version.