add "filesFolder" key to settings var
now fill the "directory" filed
add handler to get cover description
add template to cover image
add model and view to manage the cover image description
add styles to the cover image template
add model and view to cover image
add template to cover image
add handler to upload cover image
add "ext" key to default param
create handler to upload and create the image file
add test to save_image.py handler