Move services into docker (release v0.8.0)

This is probably phase one of migrating to coreOS: getting all of the dependencies into isolated containers. This should drastically speed up provisioning, since we will no longer need to build dependent tools and languages (logplex+erlang+redis, hipache+node+redis), but aufs layers will be downloaded instead.

Do not merge yet!

- [x] Logplex
- [x] Postgres
- [x] Hipache
- [x] Rails API server
- [x] Git server