Changes to setup.py: spec test files now included when testing with Python 3.
Changes to setup.py: spec test files now included when testing with Python 3.

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