Added docs for Pjax's `navigateOnHash` attribute.

Tweaked Pjax API docs to inlcude @since tags.

Added `navigateOnHash` attribute to PjaxBase. This allow Pjax to be configured to fire its `navigate` event when the new URL being navigated to only differs from the current URL by its hash.

Pjax now handles <a href="#in-page"> links properly, like a browser.

Updated PjaxBase's `_resolvePath()` method to be more robust.

Removed out of scope references to `location`. Went through the all YUI source and removed any references to the `location` object that were created outside of the function in which they were being used.

Pjax API docs.

API doc updates for Y.App and Y.PjaxBase. Feedback from users in #yui surfaced the need for more clarity around Y.App's `viewContainer` attribute.

Major revamp of PjaxBase and its navigation features. Also API docs. This is pretty much a re-write of PjaxBase to be more aligned with the way we want navigation and URLs to be handled as outlined by this: https://gist.github.com/1386827 PjaxBase is now fully API documented, complete with code-comments. There is also some minor updates to the unit tests.

Major revamp of PjaxBase and its navigation features. Also API docs. This is pretty much a re-write of PjaxBase to be more aligned with the way we want navigation and URLs to be handled as outlined by this: https://gist.github.com/1386827 PjaxBase is now fully API documented, complete with code-comments. There is also some minor updates to the unit tests.

Wrapped PjaxBase's call to `_pjaxBindUI()` which `html5` check. This makes it easier for things using PjaxBase to call its event-binding method even when not an HTML5 browser.

PjaxBase now resolves URLs correctly by using the current root path. Browsers always resolve URLs against the current value of `window.location.pathname` and so should PjaxBase. Updated Pjax tests to restore the URL after completing each test. Manual tests were updated to be correctly select the new contented that was loaded by Pjax.

Rename Controller to Router. Y.Controller is now an alias for Y.Router (ditto the controller module), but this alias will be removed in a future version of YUI.

Update Pjax to deal with Controller changes.

Renamed Pjax's `load()` method to `navigate()` which fires `navigate`. Pjax's `load()` method was replaced with a `navigate(url, options)` method and when called will fire the `navigate` event. "Navigate" is a higher-level concept than "load" and more accurately applies to Pjax's role. The Pjax tests have also been updated to reflect this change.

Improved PjaxBase's URL resolving.

Moved content related methods and attributes from PjaxBase to Pjax. PjaxBase does not use `getContent()`, `contentSelector`, or `titleSelector` internally; it makes more sense for these content related methods and attributes to live on Pjax.

Changed the process that Pjax uses to resolve link clicks to `save()`. The process was broken before, this process is more correct.

Refactor Pjax into pjax-base, pjax, and pjax-plugin modules. PjaxBase is meant to be a mixin for Controller. Pjax extends Controller and mixes in PjaxBase to provide a usable Pjax implementation. Plugin.Pjax extends Pjax and can be plugged into a Node instance.