New bindit_partial script generator, standalone packages for OS X and linux

0.2.2 (2019-07-26)

• Patch --version argument for standalone installs.

0.2.1 (2019-07-26)

• Handle missing docker binary more gracefully to support e.g. dryrun mode on machines
  without docker installed (and eventually, singularity).

0.2.0 (2019-07-25)

• New bindit_partial utility for generating command-line wrapper scripts
• Tests improved, bugs squashed (0.1.0 was easy to break, this release is much more
  robust
• Comprehensive documentation with reasonable docstrings