split CLI from application logic so this can be used programmatically

[svnlto]

[lalitkapoor]

@svnlto - thanks for the idea, I agree :) I'm planning on doing some code cleanup pretty soon and I'll try and make this possible then, otherwise I'll get to it shortly thereafter.

If you don't mind, I'd really appreciate your feedback - what functionality or improvements would you like to see? Is there anything I can do to help integrate this into your release scripts? How else can I make this tool more useful for you? Thanks!