Fix client side locales loading
Feedback API, first draft
Enable multi file upload and better error handling
changed values of naturalWidth and naturalHeight
* fixed export issue on distributed application servers (download file on get)
*added extra option to helpers._url() : "params"
fixed scrolling in preview
integration of mediaSIzer in progress : 
* added (optional) option "title" to reourcemgr
* modified initBlocks
mediasier : added extra option "responsive" (boolean)
* imageResizer properly initialized after item saving and reloading
* _round precision defaults to 0 now (required by standard)
waitSeconds added to config
* util/dom added
* added class "opened" to displayed modals
* resourcemgr : passed target dom element on create event fire