add support for satis

[roodkcab]

(brief, plain english overview of your changes here)

This pull request makes the following changes:

• add tarball support for satis

It relates to the following issue #s:

• Fixes Proxying private repository doesn`t work #29

[sonatypecla]

Thanks for the contribution! Unfortunately we can't verify if the committer(s), buaacss [email protected], signed the CLA because they have not associated their commits with their GitHub user. Please follow these instructions to associate your commits with your GitHub user. Then sign the Sonatype Contributor License Agreement and this Pull Request will be revalidated.

[herndlm]

Hi,

@roodkcab are you still interested in this? If so, can you sign the CLA please?
Alternatively, would you be fine if somebody takes over the changes and re-creates the PR?

Would a member of the community be able to look at PRs here or the new one if re-created? @acockrell @bradbeck @csgillespie @DarthHater @davidkarlsen @mpiggott @whyjustin

[herndlm]

btw I saw that our Satis uses zip archives, but seems to be still not working in a proxy repo. Not yet sure why though, I would need to further debug this. Ah it might be related to #22