Bug fixes

This release was mainly focused on testing and minor bugfixes.

This release has a wealth of new of bug fixes, along with some new features. The most notable change is a dramatic reduction in memory requirements during backups, down from possibly multiple gigabytes to ~100mb.

As always, a huge thank you to all contributors, and especially to couturier who has been doing an amazing job on supporting folks on the issue queue.

modify the way of including libraries.

Don't use this release since exceptions are thrown due to errors in refactoring drupal_set_message to use MessageInterface. Use the 8.x-2.0-rc2 release instead.