event refactor and errors

src/errors.js

@@ -0,0 +1,23 @@
+function CommandProcessError(msg) {
+  this.msg = msg; 
+}
+
+CommandProcessError.prototype = _.copy(Error.prototype);
+
+CommandProcessError.prototype.toString = function() {
+  return 'Command Process Error: ' + this.msg;
+};
+
+function CommandResult(msg) {
+  this.msg = msg; 
+}
+
+CommandResult.prototype = _.copy(Error.prototype);
+
+CommandResult.prototype.toString = function() {
+  return 'Command Result: ' + this.msg;
+};
+
+CommandResult.prototype.toResult = function() {
+  return this.msg.replace('\n', '</br>');
+};