fix contenttypes.generic warning in django 1.7

taggit/managers.py

@@ -2,7 +2,10 @@ from __future__ import unicode_literals
 from operator import attrgetter
 
 from django import VERSION
-from django.contrib.contenttypes.generic import GenericRelation
+try:
+    from django.contrib.contenttypes.fields import GenericRelation
+except ImportError:  # django < 1.7
+    from django.contrib.contenttypes.generic import GenericRelation
 from django.contrib.contenttypes.models import ContentType
 from django.db import models, router
 from django.db.models.fields import Field

taggit/models.py

 from __future__ import unicode_literals
 
 from django.contrib.contenttypes.models import ContentType
-from django.contrib.contenttypes.generic import GenericForeignKey
+try:
+    from django.contrib.contenttypes.fields import GenericForeignKey
+except ImportError:  # django < 1.7
+    from django.contrib.contenttypes.generic import GenericForeignKey
 from django.db import models, IntegrityError, transaction
 from django.db.models.query import QuerySet
 from django.template.defaultfilters import slugify as default_slugify