The goal is to get rid off the neoctl command-line tool, and to manage the
cluster via a web browser, or tools like 'wget'. Then, it will be possible to
provide an web user interface to connect to the underlying DB of any storage
node, usually a SQL client.

The design of admin app is finished:
- it's threaded like clients
- it's a WSGI app

I also hacked a HTTP API as quickly as possible to make all tests pass.

TODO:
- SSL
- define a better HTTP API
- there's no UI at all yet
- remove all unused packets from the protocol (those that were only used
  between neoctl and admin node)

There are a few dead files, not deleted yet, in case that they contain a few
pieces of useful code:
 neo/neoctl/app.py
 neo/neoctl/handler.py
 neo/scripts/neoctl.py