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Minimize tempfile churn (#186)

Closes #185.

Try was making way too many tempfiles. Now we store everything in the sandbox, with a tiny bit of nuance: $IGNORE_FILE needs to be created in advance to handle the args properly. So we create that temporary unconditionally. When running a command (the try() function), we'll move $IGNORE_FILE into the sandbox. When running try commit or try summary, we just delete $IGNORE_FILE at the end.

v0.2.0

• Refactor tests.
• Improved linting.
• Hide try-internal variables from scripts.
• Style guide.
• Testing in Vagrant.
• Support nested mounts.
• Resolve issues with userxattr.
• Better support for unionfs.
• Use /bin/sh, not /bin/bash.
• -i flag to ignore paths.
• Interactive improvements.

v0.1.0

Initial release.