Write initial feature for deployments
Implement steps for seeing deployments
Remove unused factory

:invalid_target is not used anywhere.
Fix typo in targets URL
Add factory for Deployment
Implement 'See previous deployments'
Implement queueing a new deployment
Disable Deploy button queued deployments
Prevent accidental double-queueing
Update for clean code
Disable AlwaysAddDbIndexCheck best practice

This also triggers on `t.references :model`, which
automatically includes a db index.

[ci skip]
Refactor cucumber steps
Update styling and info for deployments
Introduce decorator for Deployment
Refactor Target#deploy!

Automagically take into account deployable? status.
Merge pull request #9 from ariejan/queue_deployments

Queue Deployments