Merges branch 'release/0.5.1' into develop
Adds Attribution to Imgur.com
Updates to Arrow 1.7.0
Adds Ember I18n based localization.

* TODO: figure out how to do localization of attributes.
* Pending Localizations
  * verifypin section body.
  * cleanup album section body.
Adds default localization.
Adds pomo:build task to build translations.
Updates Arrow to 1.8.0.
Merges branch 'feature/localize-plugin' into develop
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
Updates arrowVersion in main plugin file.
Clarifies faq
Bumps version to 0.6.0 and updates changelog