Fix wait for UptoBox

When downloading a file right after having downloaded one on UptoBox, you get this message in the html page :

<center><b>You have to wait 14 minutes, 59 seconds till next download.<br /><br />Download files instantly with <a href='http://uptobox.com/?op=payments' class="blue_link" style="font-size:12px;">Premium-account</a>.</b>

The current result of re.findall(r'(\d+)\s*(hour|minute|second)', self.errmsg) is:
[('14', 'minute'), ('59', 'second'), ('12', '')] and an exception is thrown when computing the wait time because of the third element of the list.

The '?' should be removed from the regexp.