add web3 to console help

lib/console.js

@@ -22,6 +22,9 @@ Console.prototype.executeCmd = function(cmd, callback) {
       'Welcome to Embark 2',
       '',
       'possible commands are:',
+      // TODO: only if the blockchain is actually active!
+      // will need to pass te current embark state here
+      'web3 - instantiated web3.js object configured to the current environment',
       'quit - to immediatly exit',
       '',
       'The web3 object and the interfaces for the deployed contrats and their methods are also available'