Facelift fails to compile on MAC

[rsadhu]

Observation :
Mac fails to compile because of failure to import jinja2 in file generator.py
//Error : #from jinja2.debug import make_traceback as _make_traceback

Preconditions:
Jinja2 was also installed along with necessary dependencies.

Solution:
Remove the line 26 from generator.py where import of jinja2.debug is used.
Seems jinja is reduntant ..