[IMP] web_client.js: trigger web_client_ready on core.bus

This way, any module requiring web.core has access to this hook.

var core = require('web.core');
core.bus.on('web_client_ready', this, function() {console.log('ready')});

addons/web/static/src/js/web_client.js

@@ -57,7 +57,7 @@ var WebClient = Widget.extend({
                 self.action_manager.do_action(self.client_options.action);
                 delete(self.client_options.action);
             }
-            self.trigger('web_client_ready');
+            core.bus.trigger('web_client_ready');
         });
     },
     bind_events: function() {