[#81142624][WIP] Start of UI for uploading images
Fix adhoc toolbar button animations
Merge with master
update standard task gemspec
Duplicating AttachmentUploader for now :(

For some reason when AdhocAttachmentUploader inherits from AttachmentUploader Sidkiq decides to
ignore AdhocAttachmentUploader and invokes AttachmentUploader directly.
Merge remote-tracking branch 'origin/master' into images_in_adhoc_card
[#81142624][WIP] Image upload progress and preview
Update serializers to account for polymorphically associated attachments
Merge remote-tracking branch 'origin/master' into images_in_adhoc_card
change newBlocks default value
add attachment as a test dependency
Add specs for worker
use vanilla ember data to delete uploaded image
Merge remote-tracking branch 'origin/master' into images_in_adhoc_card

Conflicts:
	db/schema.rb
fix hound warning
Merge pull request #577 from Tahi-project/images_in_adhoc_card

Upload Images to Ad-Hoc Cards

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@felixflore @nummi