Fixed most of the issues with get_user_stats

Following Quora's changement in UI pyquora wasn't able to scrap data from quora.com/<user> correctly.
This pull request fix most of this issue and provide all the data needed except: the number of blogs created by the user and the number of topics he follow.

Tested: Yes w/ quora-api on a local server with 3/4 different users, all the json output are correct and everything seems to work fine.