isAlive should be is_alive in webserv.py

[gratefulfrog]

Hi,

Thanks for the great stuff! I really like your library and hope it will solve all my problems...

In addition to the attribute error in issue #5 which can be worked around with just outcommenting line 46 in steppergroup.py,

there is an incorrect method call in the file
pootles_utils/pootlestuff/webserv.py

Line 102 reads:
while sthread.isAlive():
but this should be:
while sthread.is_alive():

This is easily fixed!

Cheers,
Bob