/*!
Get an list with all plugin and group names in tree
@param  {Object} plugins tree.plugins
@return {Array}         list of all plugins in tree
function (plugins, groups) {
	var result = [],
		i;
	for (i in plugins) {
		result.push( i );
	}
	for (i in groups) {
		result.push( i );
	}
	return result;
}