Fixed HTTPError

Catches exceptions tending from the unreliability of Manipal servers and
sleeps for 1 second to try again. Hence, yields result always

The previously made attendance python script has been deployed to GAE on
the URL:

http://mitxattn.appspot.com/

For the attendance try-

http://mitxattn.appspot.com/attendance/regno/yyyy-mm-dd

Ex - http://mitxattn.appspot.com/attendance/110905044/1993-02-20