Debian refactor

Mentioned in #8, I have finished my refactoring of this repository.

1. Added sysvinit support to `node-hipache`, `tsuru-server` and `gandalf-server`. Thus these services can be started in traditional Debian way.
1. Added a local repository powered by `reprepro` to host binary packages for both Debian and Ubuntu.
2. Fixed node-hipache ``debian`` folder's bug, now it can be built under the newest version of NPM.
3. Rewrited Makefile, added prerequisites. Now we can build all source packages just with `make buildsrc`, `make builddeb` for all binary packages, and `PPA=<ppa> make upload` to uploading all source packages to PPA (only Ubuntu).
4. Removed unavailable package `tsuru-node-agent`. Its git repository in Github has been deleted.
5. Added `dh-golang` building procedure to support building `lxc-docker` for precise.