Use a faster hashing algorithm for testing

http://slacy.com/blog/2012/04/make-your-tests-faster-in-django-1-4/

rake fasttest_lms goes from 48 to 26 seconds.

lms/envs/test.py

@@ -172,3 +172,15 @@ FILE_UPLOAD_HANDLERS = (
     'django.core.files.uploadhandler.MemoryFileUploadHandler',
     'django.core.files.uploadhandler.TemporaryFileUploadHandler',
 )
+
+################### Make tests faster
+
+#http://slacy.com/blog/2012/04/make-your-tests-faster-in-django-1-4/
+PASSWORD_HASHERS = (
+    # 'django.contrib.auth.hashers.PBKDF2PasswordHasher',
+    # 'django.contrib.auth.hashers.PBKDF2SHA1PasswordHasher',
+    # 'django.contrib.auth.hashers.BCryptPasswordHasher',
+    'django.contrib.auth.hashers.SHA1PasswordHasher',
+    'django.contrib.auth.hashers.MD5PasswordHasher',
+    # 'django.contrib.auth.hashers.CryptPasswordHasher',
+)