Added the ability to create a team with SSO services and added the ability to turn off email sign up.

docker/dev/config_docker.json

@@ -22,16 +22,27 @@
         "AnalyticsUrl": "",
         "UseLocalStorage": true,
         "StorageDirectory": "/mattermost/data/",
-        "AllowedLoginAttempts": 10
+        "AllowedLoginAttempts": 10,
+        "AllowEmailSignUp": true
     },
     "SSOSettings": {
         "gitlab": {
             "Allow": false,
             "Secret" : "",
             "Id": "",
+            "Scope": "",
             "AuthEndpoint": "",
             "TokenEndpoint": "",
             "UserApiEndpoint": ""
+        },
+        "google": {
+            "Allow": false,
+            "Secret": "",
+            "Id": "",
+            "Scope": "email profile",
+            "AuthEndpoint": "https://accounts.google.com/o/oauth2/auth",
+            "TokenEndpoint": "https://www.googleapis.com/oauth2/v3/token",
+            "UserApiEndpoint": "https://www.googleapis.com/plus/v1/people/me"
         }
     },
     "SqlSettings": {