Update to v2.4 core reporting API

In short: Google has shut down v2.3 of the reporting API. The stable branch of this module is being updated to use v2.4 URLs.

Original report by scott_earnest:

When trying to set up a Google account for authorization, I get to the "Grant Access" page on Google. However, when I click the grant access button it returns me to the admin settings screen without any google analytics account information.

I see the following information in the watchdog, which appears to be coming from Google.
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Code: 404 - Error: Not Found - Message: Error 404 (Not Found)!!1 *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}} 404. That’s an error. The requested URL /analytics/feeds/accounts/default?max-results=1000&oauth_consumer_key=anonymous&oauth_nonce=****************&oauth_signature=****************%3D&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1345752101&oauth_token=****************&oauth_version=1.0&start-index=1&v=2 was not found on this server. That’s all we know.
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(I *'d out some info above)

I am also seeing the issue on sites that already have had the Google Analytics Reports set up and authorized. On these sites the reports still run but the admin settings page acts as if the site has not yet authenticated, and the above message appears.

Maybe this url is no longer valid?
https://www.google.com/analytics/feeds/accounts/default

Maybe some updates need to be made to GAFeed.lib.inc ? I can see in version 7 some of the paths have changed for getting the account list.

Please let me know if any more information is needed.