Checks if authorized before adding attacment postmeta hooks.
Catches error if list of items to queue errored out.
Adds rudimentary acceleration to TaskQueue.

* By default tasks start out in serial upto batchSize then acceleration
  into maxBatchSized tasks.
* ie:- Uploads 1-4 are serial, at which point parallelization kicks in.
* This gives better initial response, which otherwise will have to wait
  for the first image of the 4 parallel requests to complete.
Fixed error `notice` jank.
Removes debugging code.
Fixed missing localization of `album`.
Tests if localizations are present.
Adds test for ImagePackager.
Merges branch 'feature/improve-coverage' into develop