Refactor attachments

Conflicts:
	db/schema.rb
Store attachments where logos are stored
Migrate old attachments
Remove lots of dead code in attachments and library dependencies
Make multi download and remove work again for attachments, refactor controller
Removed a bunch of code from attachments controller/model
Make tests for attachments pass. They're mostly abilities tests
Remove unused gems and files
Remove unused fields from attacments
Remove many unused gems
Remove old file with references to fcbk
Remove station and attachment stuff
Redo some queries in controllers to pass tests
Correct space count in manage controller
Update gems based on bundler-audit output
Merge remote-tracking branch 'origin/branch-v2-kill-station' into branch-v2

Changes added to this merge:
* Fix the migrations that were failing after the model Tag was removed

Conflicts:
	Gemfile.lock
	db/schema.rb
Several improvements in attachments after merging #454

Includes:
* Clean up in the javascript files: it had files not being used and a big
  file that was completely refactored
* Clean up in the views, removing unused ones and simplifying the views left
* Putting things in the coding standards used in the project
* Restricting routes that are not necessary

refs #454