Fix imports for django 1.8

Author: EnTeQuAk

django_babel/extract.py

@@ -1,5 +1,10 @@
 # -*- coding: utf-8 -*-
-from django.template import Lexer, TOKEN_TEXT, TOKEN_VAR, TOKEN_BLOCK
+try:
+    from django.template import Lexer, TOKEN_TEXT, TOKEN_VAR, TOKEN_BLOCK
+except ImportError:
+    # Django 1.8 moved most stuff to .base
+    from django.template.base import Lexer, TOKEN_TEXT, TOKEN_VAR, TOKEN_BLOCK
+
 from django.utils.translation.trans_real import (
     inline_re, block_re, endblock_re, plural_re, constant_re)
 from django.utils.encoding import smart_text