Merge pull request #140 from 10up/feature/wpcli-messaging

Feature/wpcli messaging
Update readme
Merge branch 'feature/wpcli-messaging'
Revert "Feature/wpcli messaging"
Merge pull request #141 from 10up/revert-140-feature/wpcli-messaging

Revert "Feature/wpcli messaging"
Remove bad author arg from testing post creation tool; move test post type registration to test setup
Merge branch 'develop' into feature/wpcli-messaging
Re-add connection/error debugging messages back to WP-CLI