removed dev_ike and dev_shared_preview

cms/envs/dev_ike.py

-# We intentionally define lots of variables that aren't used, and
-# want to import all variables from base settings files
-# pylint: disable=wildcard-import, unused-wildcard-import
-
-# dev environment for ichuang/mit
-
-# FORCE_SCRIPT_NAME = '/cms'
-
-from .common import *
-from .dev import *
-
-FEATURES['AUTH_USE_CERTIFICATES'] = True
-
-FEATURES['USE_DJANGO_PIPELINE'] = False      # don't recompile scss
-
-SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTOCOL', 'https')  	# django 1.4 for nginx ssl proxy

cms/envs/dev_shared_preview.py

-"""
-This configuration is have localdev use a preview.localhost hostname for the preview LMS so that we can share
-the same process between preview and published
-"""
-
-# We intentionally define lots of variables that aren't used, and
-# want to import all variables from base settings files
-# pylint: disable=wildcard-import, unused-wildcard-import
-
-from .dev import *
-
-FEATURES['PREVIEW_LMS_BASE'] = "preview.localhost:8000"