// GET parameter to search variable
$scope.$watch(function() {
  return $location.path();
}, function(path) {
  $scope.query =path.substr(1).split(/(?:\s|,)+/);
};

// Search variable to GET parameter
$scope.$watch('query', function(newValue, oldValue) {
  if (newValue && newValue != oldValue && $location.path().substr(1) != newValue) {
    $location.path('/search/'+newValue);
  }
});