Small bug patch on v0.3.1

Contains all of the good changes of v0.3.1 but with one less bad change - shutdowns won't run into the race condition of list iterators changing sizes anymore.

v0.3.1 - Stability and Shutdown improvements

Version 0.3.1 brings a few stability improvements:

• Improved checking to ensure that only one unit is linked to an MTurk HIT at a time
• Properly returning live tasks to the pool if a worker returns while in the WAITING status
• Correct final statuses on static task units
• Cleaner and more consistent shutdown behavior, as well as a force_shutdown implementation to use in tests and automated scripts.

It also has a few improvements with ParlAI tasks.

First release post path migration

This Mephisto release contains no core functionality improvements over v0.2.2, but has now removed the backwards-compatible import locations across the codebase. It also includes the creation of a more complete README structure for the project.

This signifies the completion of the plan set out in #285.

Last release before old paths are removed.

This release includes all minor changes and fixes since v0.2.1 (fixing some imports, additional functionality for ParlAI blueprints, and cleanup script improvements for MTurk). These will be the last changes before v0.3.0.

Transition version between v0.0 and v1.0 dir structure

This release is to be used to transition from v0.2.1 to v0.3 safely, as a means to upgrade to the directory structure Mephisto will be using in the v1.0 release. It includes all of the old import locations, but with warnings that they will be removed in the next release.

Last Mephisto build with v0.0 directory structure.

Final version of Mephisto released on the v0.0 directory structure. Following versions will start to utilize the structure outlined in #285. Following builds will have a different standard structure more closely matching our architecture documents.

Last ARG_STRING-based Alpha version

Last stable Mephisto alpha version that still relies on use of ARG_STRING and RunScriptParser. Future versions rely on Hydra.

More details about the change are in #246.