Adjustments to support downstream consumers

Adjustments to support downstream consumers:
- Addition of merge_var value to contain FNAME and LNAME
- Adjustment to use `uid` rather than `drupal_uid`
- Adjustment to use `activity_timestamp` rather than `drupal_registration_timestamp`
- Include `password` in payload for use in transaction email
- Adds Mobile Common queue (`mbc-user-mobile`).