Merge pull request ilikenwf#92 from varhub/hotfix/correct-way-to-solv…

…e-non-md5-uris

fix get_uris() bug introduced at ilikenwf#91

Proper default / config file / environment variables handling.

 * Now load variables in correct order. Only disadvantage: A reference value is
   needed to check if variable was manually set or not. And you shouldn't use
   this value as option string.
   env vars -> tmp vars (perhabs change context: tmp vars are now env vars)
   default vars -> vars
   config file vars -> vars
   tmp vars (if not reference value) -> vars

version bump v1.5

version bump

add old, original apt-fast to repo