Publish generator as NPM module

[b00gizm]

The generator itself should be distributed as (global) NPM module, ideally under the name compose-node

Global installation:

npm install -g compose-node

Project generation

compose-node generate -i
compose-node generate express mongodb react
compose-node generate express mongodb react -o ~/Desktop

1. Generate project interactively and write it to the current directory
2. Generate project via command line args (see #20) and write it to the current directory
3. Generate project via command line args (see #20) and write it to ~/Desktop