Fix isort settings
line_length=80
indent=' '
multi_line_output=4
-default_section=FIRSTPARTY
-known_firstparty=readthedocs,readthedocsinc
-known_third_party=celery,stripe,requests,pytz,builtins,django,annoying,readthedocs_build
+default_section=THIRDPARTY
+known_first_party=readthedocs,readthedocsinc
+known_third_party=mock
sections=FUTURE,STDLIB,THIRDPARTY,FIRSTPARTY,LOCALFOLDER
add_imports=from __future__ import division, from __future__ import print_function, from __future__ import unicode_literals
