Changelog

• Converted to Drupal 8.
• Converted persistent variables to state system.
• Converted shunts to configuration entities CRUD-able via the web UI.
• Replaced drush shunt-get-enabled and drush shunt-get-disabled with drush shunt-list (filterable by --status=<tripped|not tripped>).
• Replaced drush shunt-is-enabled with drush shunt-info.
• Changed all Drush commands except shunt-list to accept a list of one or more shunts (space-or-comma separated) or the option --all.
• Replaced Drush shunt name prompts with command completion. (Try drush shunt-enable <TAB>.)
• Added Drush shunt name wildcard expansion. (Try drush shunt-enable sh\*.)
• Added support for awesome new Drush command output formats.
• Prefixed all Drush command aliases with "sh" instead of just "s" for better namespace collision prevention.
• Replaced hook_shunt_enable() and hook_shunt_disable() with hook_shunt_status_change().
• Updated Drush prompts and confirmation messages to reflect the pattern set by Drush pm commands. e.g.:

$ drush shunt-trip --all
Shunt "shunt_example" is already tripped.                        [ok]
The following shunts will be tripped: shunt
Do you want to continue? (y/n): y
Shunt "shunt" has been tripped.                                  [status]

• Added a working example page to the Shunt Example module that responds to the "shuntexample" shunt with a fail whale.
• Added comprehensive Unish tests and some Simpletest covererage.
• Replaced shunt_is_enabled() with \Drupal\shunt\Entity\Shunt::load('shunt')->isTripped();.
• Added shunt status change logging to watchdog.