Dynamically adjust placedholder for uploads and fix Dropzone event handlers
Override error handler to prevent error messages from being inserted underneath image preview
Fix tests
Use regexp instead of startsWith for better browser compatibility
Remove duplicate code in _replace.html.haml and use one template
Remove files upon error and retain alert messages until user adds a new file
Refactor upload and replace functionality
Rename file and move CSS
Fix typo
Make dropzone a div
Remove unnecessary file
Change color of "upload existing one"
Add missing changes
