Issue title: Critical Error during the upgrade process
 Issue body: After fresh install (i download last.zip today = 0.2.24), i got a message to upgrade piwik (same like http://piwik.org/blog/wp-content/uploads/2008/11/piwik_update.png)

After click "Upgrade piwik", i got this message :
Critical Error during the upgrade process: 
Error trying to create the option table in Mysql: SQLSTATE[42S01]: Base table or view already exists: 1050 La table 'option' existe dj

 Comments: 
 Comment 0: I think same problem that 444 (#444)

 Comment 1: see #444

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