Support for passing arguments to escape from jinja2 templates.

[Patristo]

Added the ability to pass arguments to escape from a jinja2 template.

It's not a big deal, but would be nice to be able to specify fold_newlines within jinja2.

The tests require jinja2 to pass (which isn't currently listed as a dependency).

[Patristo]

Any thoughts/feedback?

I can easily workaround in the jinja template, but I felt it worth making the parameters available to a template writer.