Added comments to most HTML pages
Download User Information
=========================

* Added download user button to user settings page.
* Added download_account.php to allow call user infomation and package it
into a zip folder containing xml documents.
* Added download_account() function to user.js that sends an ajax request
to download_account.php and then redirects to user to the zip folder
download page.
* Added delete_tmp.php to delete the files generated when downloading a
user this file is temporary.