Implemented savePreferences API

pkg/api/preferences.go

@@ -0,0 +1,21 @@
+package api
+
+import (
+	"github.com/grafana/grafana/pkg/bus"
+	"github.com/grafana/grafana/pkg/middleware"
+	m "github.com/grafana/grafana/pkg/models"
+)
+
+// PUT /api/user/prefs
+func SaveUserPreferences(c *middleware.Context, cmd m.SavePreferencesCommand) Response {
+
+	cmd.PrefId = c.UserId
+	cmd.PrefType = `user`
+
+	if err := bus.Dispatch(&cmd); err != nil {
+		return ApiError(500, "Failed to saved user preferences", err)
+	}
+
+	return ApiSuccess("User preferences saved")
+
+}