Normalize the way to get the URL in case that path is not provided.

[jorgecasar]

This solve the error that happens when application runs in root path (location.pathname === '/') and navigate using anchor link. There was 2 diferent ways to generate the URL, one for page.start and other for cases when event.state is not provided on popstate event.

[froucher]

Great! thx @jorgecasar! Please, this pull request is urgent for us...

[matthewp]

Can you explain what this fixes?

[jorgecasar]

There are 3 places in the code where the path is managed. And each part get it with different approach. This commit try to normalize and always get the path following the same rules. Sometimes you lost url info because of the parsers. The correct one is the Approach 1, the other cause errors because of the search info and hashbang.

Approach 1:
var url = (hashbang && ~location.hash.indexOf('#!')) ? location.hash.substr(2) + location.search : location.pathname + location.search + location.hash;

Approach 2:
var url = location.pathname + location.hash

Approach 3:
var path = el.pathname + el.search + (el.hash || '');