feat(CLI): engine checks resource and method args

We are now at a spot where we can actually start parsing arguments.

* ArgumentError -> ClIError - seems more fitting

Fixes #55

src/rust/api/cmn.rs

@@ -215,7 +215,7 @@ pub struct DefaultDelegate;
 impl Delegate for DefaultDelegate {}
 
 
-
+#[derive(Debug)]
 pub enum Error {
     /// The http connection failed
     HttpError(hyper::HttpError),