added ajax to destroy link in upload/s partials and Email functionality.
adding tables to views
added download buttons and functionality *not done
added validations to user model
added download button for recipients files
add file_accessed mail to download action
add callback to set expiration for user
update controller with respond_with/to
Added Bootstrap and a little style to views, and changed user expiration generation on after callback.
added title yielder to layout
removed old line of code.
deleted old files