Run import run operations in order.

Closes #1977, Refs #3473
- Ensure that import operations are run in sequence.
  Previously the operations were started in order but subsequent
  ops were allowed to begin before the previous finished, which would
  result in out-of-order execution.
- Fix bug in attach() where a model property was being passed in
  instead of a transaction object.  If the call was made when a
  transaction was in process, it could cause bookshelf/knex to
  hang and never finish the transaction.
Merge pull request #3891 from jaswilli/import-tests

Run import run operations in order.
Implements new Configuration API

closes #3619
- adds new permissions for configuration API
- adds integration tests
- adds configuration API for reading allowed values