add removegroup function, gh Flotype#163

lib/handlers.js

@@ -138,4 +138,20 @@ exports.initialize = function (nowjs) {
   nowjs.on('groupdel', function (e) {
     deleteVar(e, e.fqn);
   });
+
+  nowjs.on('removegroup', function (name) {
+    if (nowUtil.hasProperty(this.groups, name)) {
+      var self = this;
+      // Get the actual group
+      group = this.getGroup(name);
+      group.getUsers(function(users){
+        users.map(function(user){
+          group.removeUser(user);  
+        });
+      });
+      // Finally, delete the group itself.
+      delete this.groups[name];
+    }
+  });
+
 };

lib/now.js

@@ -112,6 +112,29 @@ Now.prototype.getGroup = function (name) {
   return this.groups[name];
 };
 
+/**
+ * @memberOf nowjs#
+ * @function
+ * @name removeGroup
+ * @description Removes all traces of a group.
+ * @param {String} name The name of the group to be retrieved.
+ * @type Group
+ * @example var new_group = nowjs.getGroup('a new group');
+ */
+Now.prototype.removeGroup = function (name) {
+  /**
+   * @name nowjs#removegroup
+   * @event
+   * @param {Group} group The group removed by {@link nowjs#getGroup}.
+   * @description Called when a group is removed.
+   * @example nowjs.on('removegroup', function (group) {
+   *   console.log('Group `' + group.groupName + '` eliminated from existence.');
+   * });
+   */
+  this.emit('removegroup', name);
+};
+
+
 /**
  * @static
  * @memberOf nowjs