Add method to allow uploads without provided hash
add upload servlet for multiple files
add jquery file upload library
add javascript templates library
modify main script for fileupload to work with multi-file-upload widget
strip CDATA from template strings
create multi file upload widget
limit uploads to accepted file types
prepend modal dialogs to body to prevent automatic cloning
Various display behaviour tweaks to file upload dialog.

    - when there is an error adding a file, just show an error and do not add it
    - show number of queued and uploading files
    - change drop zone style when files are dragged over it
    - reset dialog when it is reopened
    - close dialog when any of the cancel buttons are pressed
    - disable adding more files when upload has started
limit individual file size to 200MB
add 'accepted' attribute to multi-file-upload widget
ensure that .pot extensions are handled properly in uploaded source files.
show and hide portions of the form when upload is not supported
add multi-file-upload widget to settings page and change zanata tag prefix to z