Resurrecting config_docker.json. Moving docker related files to docker directory. Added copyright info.

config/config.json

@@ -9,7 +9,7 @@
     },
     "ServiceSettings": {
         "SiteName": "Mattermost Preview",
-        "Domain": "",
+        "Domain": "xxxxxxmustbefilledin.com",
         "Mode" : "dev",
 		"AllowTesting" : false,
         "UseSSL": false,
@@ -56,7 +56,7 @@
     "EmailSettings": {
         "SMTPUsername": "",
         "SMTPPassword": "",
-        "SMTPServer": "localhost:25",
+        "SMTPServer": "",
 		"UseTLS": false,
         "FeedbackEmail": "feedback@xxxxxxmustbefilledin.com",
         "FeedbackName": "",