- added documentation for technet_user, technet_password, wf_user &
  wf_password.
- common-os::download_tomcat now uses
  common-io:download_uri_target_to_dir
- Introduced new feature: Whenever using wget to download software,
  ece-install will add something to the UA string of wget so that it's
  possible to identify what the command downloads.

  If you wish to turn this feature off, set keep_off_wget_user_agent to
  0.