Ability to manually upload wheels to cache server

[yunmanger1]

Currently packages are uploaded only in case when there are no errors in the installation process. I think, in practice there are a lot of packages with broken setup and it would be nice to have an ability to upload wheels manually once you get a working one.

 curd upload -c http://my-cache/ some.whl

Or possibly upload all requirements that were successfully built:

 curd install -c http://my-cache/ -u --skip-errors FreakyPackage