Add g5_updatable gem
Remove validation for default number

This may need to be added back in but since this doesn't map correctly with our
other apps I'm trying this first.
Remove old updater code
Use released version of g5_updatable
Add back validation and default number param
Update g5_updatable to 0.1.0
Merge pull request #22 from G5/g5-updatable-74054406

G5 updatable 74054406