Fix regression: slug could not be set via the API when creating a
product
Continue #164 Sequenced addons

Add a (configurable) text next to the add element button
Fix the orders position on large screens
Fix a missing translation for cancelled orders
Fix #157
Add a drop zone for each imageUpload directive
Rework the whole upload process, enabling the new drop zones capabilities.
Move the upload features to a new "mayocat.upload" module
Add notifications
Fix some inconsistencies with the directives used for the drop zones
Add notifications to the upload service
Add a visual progression for each file being uploaded
Minify the progression notifications when the path is changed. Fix the size on large pages.
Fix a bug where the uploaded images weren't displayed once the upload was finished.
Increase the visibility of the notifications
Fix failing jasmine specs
Factorize the image list in a directive. Add the possibility to expand or shrink the list.
Fix the CSS of the image list when shrinked. Add translations.
Fix a visual bug in Firefox for image lists. Improve the visual feedback for each image.
Issue #169 New addon field type : image