add config files for running different server groups in dev

lms/envs/devgroups/courses.py

+from ..dev import *
+
+CLASSES_TO_DBS = {
+    'BerkeleyX/CS169.1x/2012_Fall' : "cs169.db",
+    'BerkeleyX/CS188.1x/2012_Fall' : "cs188_1.db",
+    'HarvardX/CS50x/2012' : "cs50.db",
+    'HarvardX/PH207x/2012_Fall' : "ph207.db",
+    'MITx/3.091x/2012_Fall' : "3091.db",
+    'MITx/6.002x/2012_Fall' : "6002.db",
+    'MITx/6.00x/2012_Fall' : "600.db",
+}
+
+
+CACHES = {
+   'default': {
+       'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
+       'LOCATION': '127.0.0.1:11211',
+       'KEY_FUNCTION': 'util.memcache.safe_key',
+   },
+   'general': {
+       'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
+       'LOCATION': '127.0.0.1:11211',
+       'KEY_PREFIX' : 'general',
+       'VERSION' : 5,
+       'KEY_FUNCTION': 'util.memcache.safe_key',
+   }
+}
+
+SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
+
+
+def path_for_db(db_name):
+    return ENV_ROOT / "db" / db_name
+
+def course_db_for(course_id):
+    db_name = CLASSES_TO_DBS[course_id]
+    return {
+               'default' : {
+                    'ENGINE' : 'django.db.backends.sqlite3',
+                    'NAME' : path_for_db(db_name)
+                }
+            }
+

lms/envs/devgroups/h_cs50.py

+from .courses import *
+
+DATABASES = course_db_for('HarvardX/CS50x/2012')
\ No newline at end of file

lms/envs/devgroups/m_6002.py

+from .courses import *
+
+DATABASES = course_db_for('MITx/6.002x/2012_Fall')
\ No newline at end of file

lms/envs/devgroups/portal.py

+"""
+Note that for this to work at all, you must have memcached running (or you won't
+get shared sessions)
+"""
+from courses import *
+
+# Move this to a shared file later:
+for class_id, db_name in CLASSES_TO_DBS.items():
+    DATABASES[class_id] = {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': path_for_db(db_name)
+    }
+