Removed four imports from renderengine.py: cgi, collections, inspect, types.
Removed four imports from renderengine.py: cgi, collections, inspect, types.

arlenesr28/pystache,charbeljc/pystache,beni55/pystache,charbeljc/pystache,jrnold/pystache,nitish116/pystache,harsh00008/pystache,defunkt/pystache,arlenesr28/pystache,harsh00008/pystache,harsh00008/pystache,rismalrv/pystache,nitish116/pystache,rismalrv/pystache,beni55/pystache,nitish116/pystache,jrnold/pystache,rismalrv/pystache,arlenesr28/pystache