Release 3.12.0

• Forkless mode for debugging
• Enabled Travis builds with a subset of tests (less than 15 minutes).
• DockerCall function changed to use docker API.
• Updated to Azure version 2.0.
• Added tempDir convenience function to job and made job.log an alias for fileStore.LogToMaster.
• Enhanced toil-cwl-runner to support SoftwareRequirements & BioContainers.
• Increased default retry count to 1.
• Deprecated cgcloud.
• Updated EC2 instance types.
• Upgraded pip to 9.0.1 and setup tools to 36.5.0 in appliance build.

Bug fixes

• Parasol parses jobStore path correctly.
• Parasol doesn't attempt to remove jobs that it didn't launch.
• Fixed problem with dynamic batch systems not always being created.
• Fix workflow effort being wasted if a single export fails.
• Added a default value for maxNodes.
• Fixed py.test collection errors when running locally.

Thank you to our external contributors: @jmchilton, @jorvis, @evan-wehi, @mr-c, @brainstorm