Add a new developer command (i.e., requires `HOMEBREW_DEVELOPER` set in your environment) to "boneyard" a formula, by creating one pull request removing the formula from its current tap and updating (or creating) tap_migrations.json, and another pull request importing the formula into homebrew/boneyard with any bottle block removed. Closes #53. Signed-off-by: ilovezfs <ilovezfs@icloud.com>