Add support for JSON dashboards

This patch adds the support for JSON dashboards and also provides the
support for remote dashboards.
diff --git a/README.rst b/README.rst
index fcbdef8..f806ffe 100644
--- a/README.rst
+++ b/README.rst
@@ -44,7 +44,9 @@
           user: grafana
           password: passwd
 
-Server installed with default StackLight JSON dashboards
+Server installed with default StackLight JSON dashboards. This will
+be replaced by the possibility for a service to provide its own dashboard
+using salt-mine.
 
 .. code-block:: yaml
 
@@ -202,7 +204,7 @@
           span: 6
           editable: false
           type: graph
-          targets: 
+          targets:
           - refId: A
             target: "support_prd.cfg01_iot_tcpcloud_eu.cpu.0.idle"
           datasource: graphite01