add dropzonejs to article editor
basic attachments controller to upload image
Attachments controller should respond with metadata as well
Add clippy helper for copy-to-clipboard feature
add partial for attachment modal.
fix dynamic asset path for dropzone background
Attachment creation explicitly focuses on the file attachment.
add javascript to drive the attachments
Bump odi_content_models version
Use AttachableWithMetadata::ATTACHMENT_METADATA_FIELDS instead of global constant
Add JS to update alt text
Merge pull request #44 from theodi/feature-upload-arbitrary-images

Feature upload arbitrary images