diff --git a/.travis.yml b/.travis.yml
index 0cf3e5c..eb18fac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,32 +1,29 @@
 language: python
 sudo: false
 python:
-  - "2.6"
   - "2.7"
-  - "3.2"
   - "3.3"
   - "3.4"
   - "pypy"
   - "pypy3"
 env:
-  - DJANGO="<1.6,>=1.5"
   - DJANGO="<1.7,>=1.6"
   - DJANGO="<1.8,>=1.7"
   - DJANGO="<1.9,>=1.8"
 
 matrix:
   allow_failures:
-    - env: DJANGO="<1.6,>=1.5"
     - env: DJANGO="<1.7,>=1.6"
     - python: "2.6"
     - python: "3.2"
 install:
-  - pip install --upgrade pip
+  - pip install -U pip
   - pip install .
   - pip install Django$DJANGO
-  - pip install pytest pytest-pep8 pytest-flakes
+  - pip install -U pytest pytest-pep8 pytest-flakes pytest-isort pep257
   - pip install coveralls
 script:
-  coverage run --source=stdimage runtests.py
+  - coverage run --source=stdimage runtests.py
+  - pep257 stdimage
 after_success:
   coveralls
diff --git a/README.rst b/README.rst
index 3485eb6..465a967 100644
--- a/README.rst
+++ b/README.rst
@@ -26,7 +26,6 @@ Django Field that implement the following features:
 
 * Django-Storages compatible (S3)
 * Python 2, 3 and PyPy support
-* Django 1.5 and later support
 * Resize images to different sizes
 * Access thumbnails on model level, no template tags required
 * Preserves original image
diff --git a/pytest.ini b/pytest.ini
index 37a9140..be372c8 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,7 +1,7 @@
 [pytest]
 norecursedirs=venv
 DJANGO_SETTINGS_MODULE=tests.settings
-addopts = --tb=short --pep8 --flakes -rxs
+addopts = --tb=short --pep8 --isort --flakes -rxs
 pep8ignore=
     setup.py ALL
     runtests.py ALL
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..50e382c
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,6 @@
+[pep257]
+verbose = true
+explain = true
+source = true
+count = true
+ignore = D100,D101,D102,D103
diff --git a/stdimage/management/commands/rendervariations.py b/stdimage/management/commands/rendervariations.py
index f94dca2..d0d8318 100644
--- a/stdimage/management/commands/rendervariations.py
+++ b/stdimage/management/commands/rendervariations.py
@@ -76,14 +76,13 @@ def init_progressbar(count):
 
 
 def finish_progressbar():
-    global BAR
     BAR.finish()
 
 
 def render_field_variations(kwargs):
     try:
-        global BAR
         render_variations(**kwargs)
+        global BAR
         BAR += 1
     except:
         raise Exception("".join(traceback.format_exception(*sys.exc_info())))
diff --git a/stdimage/models.py b/stdimage/models.py
index ffc60fe..d62092b 100644
--- a/stdimage/models.py
+++ b/stdimage/models.py
@@ -18,10 +18,8 @@
 
 
 class StdImageFileDescriptor(ImageFileDescriptor):
-    """
-    The variation property of the field should be accessible in instance cases
 
-    """
+    """The variation property of the field is accessible in instance cases."""
 
     def __set__(self, instance, value):
         super(StdImageFileDescriptor, self).__set__(instance, value)
@@ -29,9 +27,8 @@ def __set__(self, instance, value):
 
 
 class StdImageFieldFile(ImageFieldFile):
-    """
-    Like ImageFieldFile but handles variations.
-    """
+
+    """Like ImageFieldFile but handles variations."""
 
     def save(self, name, content, save=True):
         super(StdImageFieldFile, self).save(name, content, save)
@@ -57,18 +54,14 @@ def is_smaller(img, variation):
             or img.size[1] > variation['height']
 
     def render_variations(self, replace=False):
-        """
-        Renders all image variations and saves them to the storage
-        """
-        for key, variation in self.field.variations.items():
+        """Render all image variations and saves them to the storage."""
+        for _, variation in self.field.variations.items():
             self.render_variation(self.name, variation, replace, self.storage)
 
     @classmethod
     def render_variation(cls, file_name, variation, replace=False,
                          storage=DefaultStorage()):
-        """
-        Renders an image variation and saves it to the storage
-        """
+        """Render an image variation and saves it to the storage."""
         variation_name = cls.get_variation_name(file_name, variation['name'])
         if storage.exists(variation_name):
             if replace:
@@ -118,10 +111,7 @@ def render_variation(cls, file_name, variation, replace=False,
 
     @classmethod
     def get_variation_name(cls, file_name, variation_name):
-        """
-        Returns the variation file name based on the model
-        it's field and it's variation.
-        """
+        """Return the variation file name based on the variation."""
         ext = cls.get_file_extension(file_name)
         path = file_name.rsplit('/', 1)[0]
         file_name = file_name.rsplit('/', 1)[-1].rsplit('.', 1)[0]
@@ -134,9 +124,7 @@ def get_variation_name(cls, file_name, variation_name):
 
     @staticmethod
     def get_file_extension(filename):
-        """
-        Returns the file extension.
-        """
+        """Return the file extension."""
         return os.path.splitext(filename)[1].lower()
 
     def delete(self, save=True):
@@ -150,13 +138,25 @@ def delete_variations(self):
 
 
 class StdImageField(ImageField):
+
     """
-    Django field that behaves as ImageField, with some extra features like:
-        - Auto resizing
-        - Allow image deletion
+    Django ImageField that is able to create different size variations.
+
+    Extra features are:
+        - Django-Storages compatible (S3)
+        - Python 2, 3 and PyPy support
+        - Django 1.5 and later support
+        - Resize images to different sizes
+        - Access thumbnails on model level, no template tags required
+        - Preserves original image
+        - Asynchronous rendering (Celery & Co)
+        - Multi threading and processing for optimum performance
+        - Restrict accepted image dimensions
+        - Rename files to a standardized name (using a callable upload_to)
 
     :param variations: size variations of the image
     """
+
     descriptor_class = StdImageFileDescriptor
     attr_class = StdImageFieldFile
     def_variation = {
@@ -170,7 +170,8 @@ def __init__(self, verbose_name=None, name=None, variations=None,
                  render_variations=True, force_min_size=False,
                  *args, **kwargs):
         """
-        Standardized ImageField for Django
+        Standardized ImageField for Django.
+
         Usage: StdImageField(upload_to='PATH',
          variations={'thumbnail': {"width", "height", "crop", "resample"}})
         :param variations: size variations of the image
@@ -222,7 +223,8 @@ def add_variation(self, name, params):
 
     def set_variations(self, instance=None, **kwargs):
         """
-        Creates a "variation" object as attribute of the ImageField instance.
+        Create a "variation" object as attribute of the ImageField instance.
+
         Variation attribute will be of the same class as the original image, so
         "path", "url"... properties can be used
 
@@ -242,7 +244,7 @@ def set_variations(self, instance=None, **kwargs):
                     setattr(field, name, variation_field)
 
     def contribute_to_class(self, cls, name):
-        """Call methods for generating all operations on specified signals"""
+        """Generating all operations on specified signals."""
         super(StdImageField, self).contribute_to_class(cls, name)
         signals.post_init.connect(self.set_variations, sender=cls)
 
diff --git a/stdimage/utils.py b/stdimage/utils.py
index e1b8ec8..a446d8a 100644
--- a/stdimage/utils.py
+++ b/stdimage/utils.py
@@ -88,9 +88,7 @@ def pre_save_delete_callback(sender, instance, **kwargs):
 
 def render_variations(file_name, variations, replace=False,
                       storage=DefaultStorage()):
-    """
-    Renders all variations for a given field.
-    """
+    """Render all variations for a given field."""
     for key, variation in variations.items():
         StdImageFieldFile.render_variation(
             file_name, variation, replace, storage
diff --git a/stdimage/validators.py b/stdimage/validators.py
index cdc4515..5034652 100644
--- a/stdimage/validators.py
+++ b/stdimage/validators.py
@@ -10,9 +10,9 @@
 
 
 class BaseSizeValidator(BaseValidator):
-    """
-    Base validator that validates the size of an image.
-    """
+
+    """Base validator that validates the size of an image."""
+
     compare = lambda self, x: True
 
     def __init__(self, width, height):
@@ -36,11 +36,13 @@ def clean(value):
 
 
 class MaxSizeValidator(BaseSizeValidator):
+
     """
     ImageField validator to validate the max with and height of an image.
 
     You may use float("inf") as an infinite boundary.
     """
+
     compare = lambda self, img_size, max_size:\
         img_size[0] > max_size[0] or img_size[1] > max_size[1]
     message = _('The image you uploaded is too large.'
@@ -50,11 +52,13 @@ class MaxSizeValidator(BaseSizeValidator):
 
 
 class MinSizeValidator(BaseSizeValidator):
+
     """
     ImageField validator to validate the min with and height of an image.
 
     You may use float("inf") as an infinite boundary.
     """
+
     compare = lambda self, img_size, min_size:\
         img_size[0] < min_size[0] or img_size[1] < min_size[1]
     message = _('The image you uploaded is too small.'