Merge pull request #86 from edx/dsjen/es-config

Added settings for elasticsearch.

analyticsdataserver/settings/base.py

 """Common settings and globals."""
 
+from os import environ
 from os.path import abspath, basename, dirname, join, normpath
 from sys import stderr
 
@@ -50,6 +51,11 @@ DATABASES = {
 }
 ########## END DATABASE CONFIGURATION
 
+########## ELASTICSEARCH CONFIGURATION
+ELASTICSEARCH_LEARNERS_HOST = environ.get('ELASTICSEARCH_LEARNERS_HOST', None)
+ELASTICSEARCH_LEARNERS_INDEX = environ.get('ELASTICSEARCH_LEARNERS_INDEX', None)
+########## END ELASTICSEARCH CONFIGURATION
+
 
 ########## GENERAL CONFIGURATION
 # See: https://docs.djangoproject.com/en/dev/ref/settings/#time-zone