my attempt to disentagle repository and registry (Issue #1439)

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
try out @metalivedev's suggestion, including FQIN

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #2980 from SvenDowideit/1439-add-registry-repository-terms

my attempt to disentagle repository and registry
Merge branch 'master' of https://github.com/dotcloud/docker