v0.3.2

Changes

• Fix false positive "broken symlinks" sanity check
• Change format of cache metadata, speeding up the startup (and shutdown)
• Ctrl-C stops the workers if they were doing a job
• Add -W option to skip some sanity checks
• Add sanity check that validates the sample input/output files in att/
• Fix miscalculation of cache key when changing the extra time
• General code cleanup