fixed for python 2.6
fixed for python 2.6

objects of datetime.timedelta has no "total_seconds"
method on python 2.6

miurahr/seahub,madflow/seahub,cloudcopy/seahub,Chilledheart/seahub,Chilledheart/seahub,miurahr/seahub,madflow/seahub,madflow/seahub,Chilledheart/seahub,miurahr/seahub,madflow/seahub,madflow/seahub,Chilledheart/seahub,cloudcopy/seahub,miurahr/seahub,cloudcopy/seahub,cloudcopy/seahub,Chilledheart/seahub