Added log base 2 graph y axis scale

public/app/panels/graph/graph.js

@@ -369,7 +369,7 @@ function (angular, $, kbn, moment, _, GraphTooltip) {
           if (_.findWhere(data, {yaxis: 2})) {
             var secondY = _.clone(defaults);
             secondY.index = 2,
-            secondY.logBase = scope.panel.grid.rightLogBase || 2,
+            secondY.logBase = scope.panel.grid.rightLogBase || 1,
             secondY.position = 'right';
             secondY.min = scope.panel.grid.rightMin;
             secondY.max = scope.panel.percentage && scope.panel.stack ? 100 : scope.panel.grid.rightMax;

public/app/panels/graph/module.js

@@ -116,7 +116,7 @@ function (angular, app, $, _, kbn, moment, TimeSeries, PanelMeta) {
     _.defaults($scope.panel.grid, _d.grid);
     _.defaults($scope.panel.legend, _d.legend);
 
-    $scope.logScales = {'linear': 1, 'log (base 10)': 10, 'log (base 32)': 32, 'log (base 1024)': 1024};
+    $scope.logScales = {'linear': 1, 'log (base 2)': 2, 'log (base 10)': 10, 'log (base 32)': 32, 'log (base 1024)': 1024};
 
     $scope.hiddenSeries = {};
     $scope.seriesList = [];