Updated example JSON to follow the changes in wppm.
Commented the instance variables in WPPM_Container class so PhpStorm can use code validation and auto-complete.
Renamed WPPM_Package->repository to source.
- Renamed WPPM_Repository->source to url and removed code that previously allowed source to be specified w/o http(s)://.
- Set WPPM_Repository->id to "{$domain}/{$account}/{$repository}"