Help Request Information should be included

* This update goes along with a pull request of the same name on curate
  repository.
* This will also need the curate version bumped.

dltp-255#

Delete help_request.rb file because it is no longer needed.
DLTP-192 Adding header to enable nginx download

adding filpper gem for configuration options

configuring use_proxy_for_download option

refactoring download to use new configuration option
adding spec for download with proxy enabled