Set global_env on Jinja2Template Class

Jinja2Template.py

#!/opt/python/bin/python

class Jinja2Template(BaseTemplate):
    global_env = None
    def prepare(self, filters=None, tests=None, **kwargs):
        from jinja2 import Environment, FunctionLoader
        if 'prefix' in kwargs: # TODO: to be removed after a while
            raise RuntimeError('The keyword argument `prefix` has been removed. '
                'Use the full jinja2 environment name line_statement_prefix instead.')
        self.env = Environment(loader=FunctionLoader(self.loader), **kwargs)
        if self.global_env:
            self.env.globals.update(global_env)
        if filters: self.env.filters.update(filters)
        if tests: self.env.tests.update(tests)
        if self.source:
            self.tpl = self.env.from_string(self.source)
        else:  
          self.tpl = self.env.get_template(self.filename)

## end class Jinja2Template

## example how to set,
from bottle import Jinja2Template
Jinja2Template.global_env = {'gob', 'this_is_global_variable'}