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Use a separate "execute" for running bash commands in containers (#100)

* Always use TTY so the output shows up

* Nicer specs

* Add option of running a command on all the running instances

* Changelog

* Add all switch to run cmd on all containers

* Debug

* debug

* cleaner exec

* Version

* use open3

* Even simpler

* Exception

* undo

* Fix spec

* hound

* Separate out bash execution into a new command

* Changelog

* Update README

Add the ability to execute bash commands on remote containers (#98)

* Log the bash command being run at debug level

* Add the ability to execute bash commands on an instance

* Simpler

* no if/else

Better error messaging when trying to bash or ssh (#97)

* Better error messaging when trying to bash/ssh/etc to an instance_index that doesn't exist

* Bump version

* even better message

* Hound

* fix spec

Remove fixnum deprecation warning (#93)

Use instance profile for AWS creds (#94)

* Use instance profile for AWS creds

* 3.1.0 bump using apurvis suggestions

* Remove 3.0.11 from CHANGELOG

Fix the scale log output (#92)

* Fix the scale log output

* Log default scale if none provided

Fix bootstrap tag (#91)

* Rubocop

* @target.tag needs to be set from command line

* Just kidding; _always_ prefer the CLI version

* Reverting to just change the assertion

* Missed a delegate

* Version bump

Alphabetize targets output (#89)