Fix file import with Jinja2 >= 2.7

CHANGES.txt

+2.5 (2013-08-07)
+======================
+
+ * Fix file import with Jinja2 >= 2.7
+
 2.4.3 (2013-08-02)
 ======================
 

setup.py

 from setuptools import setup, find_packages
 import os
 
-version = '2.4.3'
+version = '2.5'
 name = 'slapos.recipe.template'
 long_description = open("README.txt").read() + "\n" + \
     open(os.path.join('slapos', 'recipe',
@@ -26,7 +26,7 @@ setup(name=name,
       install_requires=[
           'setuptools', # namespaces
           'zc.buildout', # plays with buildout
-          'jinja2',
+          'jinja2 >= 2.7',
       ],
       zip_safe=True,
       entry_points={

slapos/recipe/template/jinja2_template.py

@@ -71,11 +71,10 @@ class RelaxedPrefixLoader(PrefixLoader):
     """
     Same as PrefixLoader, but accepts imports lacking separator.
     """
-    def get_source(self, environment, template):
+    def get_loader(self, template):
         if self.delimiter not in template:
             template += self.delimiter
-        return super(RelaxedPrefixLoader, self).get_source(environment,
-            template)
+        return super(RelaxedPrefixLoader, self).get_loader(template)
 
 class RecipeBaseLoader(BaseLoader):
     """