include copy of django_extension, dont install django from git

contrib/django_extensions/docs/field_extensions.rst

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+Field Extensions
+================
+
+:synopsis: Current Field Extensions
+
+
+Current Database Model Field Extensions
+---------------------------------------
+
+* *AutoSlugField* - AutoSlugfield will automatically create a unique slug
+  increasing an appended number on the slug until it is unique. Inspired by
+  SmileyChris' Unique Slugify snippet.
+
+* *CreationDateTimeField* - DateTimeField that will automatically set it's date
+  when the object is first saved to the database. Works in the same way as the
+  deprecated auto_now_add keyword.
+
+* *ModificationDateTimeField* - DateTimeField that will automatically set it's
+  date when an object is saved to the database. Works in the same way as the
+  deprecated auto_now keyword.
+
+* *UUIDField* - UUIDField for Django, supports all uuid versions which are
+  natively supported by the uuid python module.
+  
+* *EncryptedCharField* - CharField which transparently encrypts its value as it goes in and out of the database.  Encryption is handled by `Keyczar <http://www.keyczar.org/>`_.  To use this field you must have Keyczar installed, have generated a primary encryption key, and have ``settings.KEYS_DIR`` set to the full path of your keys directory.
+
+* *EncryptedTextField* - CharField which transparently encrypts its value as it goes in and out of the database.  Encryption is handled by `Keyczar <http://www.keyczar.org/>`_.  To use this field you must have Keyczar installed, have generated a primary encryption key, and have ``settings.KEYS_DIR`` set to the full path of your keys directory.