"init" command for initializing a new mill.xml

[erunion]

Creating a mill.xml file is a bit... complicated. And tedious.

Build an init command that will walk you through, wizard-style, everything to set it up.

• [ ] Add controller directories, classes, excludes
• [ ] Add representation directories, classes, excludes
• [ ] Add error representations
• [ ] Add capabilities
• [ ] Add scopes
• [ ] Add parameter tokens
• [ ] Add URI segment translations