set sites in template engines

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
fix #1038 -- make Jinja filters configurable

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
make the filters work with mako, too

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
fix conflict