Fix Archive class to support LZMA
Fixed unit tests
Fixed typo
Fixed test_xz_archive test
Added reports/ to gitignore
Docker registry shows error on push in a openstack-swift configuration

The default delegate must be the storage driver it self. That allows to overwrite is_private.
Glance storage driver doesn’t support private images for now.

fixes #208
Merge branch 'issue-208' of github.com:chilicat/docker-registry into issue-208