adds jquery-fileupload-rails gem for file uploading
adds ajax uploader script and simple progress bar
cleans up progress uploaders
abandons carrierwave direct's form for railscast s3 form to better support ajax
changes quota to bytes from megabytes, updates views with number_to_human_size
switches attachments over to ajax
cleans up some hard coded styles
Merge branch 'ajax_file_uploads' into develop