Add docker-registry app

Changelog for 0.8.4:

• PR #188 Add docker-registry app by @alexellis

Commits
812703b Add docker-registry to readme by @alexellis
33d56fd Revert crypto in vendor by @alexellis
5a57af1 Revert crypto to working version by @alexellis
71ba46f Update vendor by @alexellis
a0d49c8 Add crypto by @alexellis
f36d42c Add planned flags for Ingress by @alexellis
30aafd4 Add docker-registry app by @alexellis
d7d1e59 Fix GCE vs GCP typo by @alexellis

Generated by Derek