Command line generation tools

Bootstrapping a plutonium-based app is very hard atm. It should be assisted through some command-line tools:

```
$ plutonium init
$ plutonium generate:app core --command-bus-server --event-bus-server
$ plutonium generate:app web --command-bus-client
$ plutonium generate:app reporters --event-bus-client
$ plutonium generate:reporter userReporter
$ plutonium generate:command "register user"
```
