driftyco/ionic — pull request #635 by ajoslin (2014-02-19 16:27:50+00:00)
Title: feat(navBar): add sensible defaults

BREAKING CHANGE: Before, if ionNavBar back-button-type attribute was not defined,
no back button will appear. Now the back button defaults to an os-specific
icon, with the previous view's title.

Additionally, before, if ionNavBar animation attribute was not defined,
no title animation would happen. Now the ionNavBar animation defaults
to nav-title-slide-ios7.

To migrate, change your code from this (used to be no back button, no
title animation):

```html

```

To this (no back button, no title animation):

```html

```