up MarketPlace controller

* up edit action
* up upload action
up UsedItemPhoto model

* up validateUploadedFiles method
up edit item view

* show error/success messages
up
up MarketPlace controller

* code refactoring
up UsedItemPhoto model

* code rafactoring
up views

* code refactoring
code refacroting
up UsedItemPhoto model

* validate max uploaded files
up UsedItemPhoto model

* code refactoring
up MarketPlace controller

* code refactoring
up MarketPlace controller

* new route to delete item preview
* add action to handle logic
up UsedItemPhoto model

* add item relation
up preview block

* show delete link
up item edit view

* show success/error message for delete preview action
up script

* confirm preview deleting
add functional test

* test delete item preview url
* update related fixtures