adding scroll and resize events

Author: duncanwerner

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "cmjs-shell",
-	"version": "0.3.0",
+	"version": "0.3.1",
 	"license": "MIT",
 	"description": "Command shell based on CodeMirror.",
 	"keywords": ["shell", "console"],

shell.js

@@ -906,7 +906,18 @@ var Shell = function( CodeMirror_, opts ){
 				instance.hide_function_tip( true );
 			}
 		});
-				
+
+		// notification listener for CM scroll event,
+		// which may be more useful that normal scroll event
+		if( opts.scroll ){
+			cm.on( "scroll", opts.scroll );
+		}
+		
+		// notification listener for CM viewport change event
+		if( opts.viewport_change ){
+			cm.on( "viewportChange", opts.viewport_change );
+		};
+			
 		cm.on( "beforeChange", function(cm, e){
 
 			// todo: split paste into separate lines,