Dependency update

Dependency update, nette.ajax.js allowed in higher version (^2.4.0).

Preserving state object on initialization

When calling replaceState on extension initialization, the original object in history state is preserved. I.e. when other JS call replaceState first with custom object, this object won't be lost after initializing history extension.

Added package.json

1.0.1

added package.json

Popstate condition fix and better `title` handling

• fixing condition in popstate event handler; since e is jQuery Event Object, there is no state property defined, we need to use e.originalEvent.state instead
• if title element has data-ajax-update, then use this title when pushing new state and set document.title to this value; see vojtech-dobes/nette.ajax.js#151