Sina account plugin uses insecure http

[Alberto Mardegan]

The sina account plugin uses "http" for its OAuth flow, but "https" is also available. That should be preferred.

http://open.weibo.com/wiki/Oauth2

And here's a couple of links that might be useful for the implementation:

http://code.google.com/p/justin-zhang-projects/source/browse/trunk/Connection/99+Other/Sina+API+test.txt?r=219
https://bitbucket.org/kaiix/weibopy/src

[Alberto Mardegan (mardy)]

It seems that something is wrong with Sina's SSL certificates. When QNetworkManager raises these errors:

"The issuer certificate of a locally looked up certificate could not be found", "The root CA certificate is not trusted for this purpose"

[Alberto Mardegan (mardy)]

Here is what firefox says:

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www.weibo.com uses an invalid security certificate.

The certificate is only valid for the following names:
  *.pantherssl.com , pantherssl.com

(Error code: ssl_error_bad_cert_domain)
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