Merge pull request #90 from millmobile/feature/flot-negative-y-axis

Let the y axis of flot chart extend to negative numbers.

lib/riemann/dash/public/views/flot.js

@@ -6,6 +6,7 @@
       this.query = json.query;
       this.title = json.title;
       this.max = json.max || null;
+      this.min = json.min || null;
       this.graphType = json.graphType || 'line';
       this.stackMode = json.stackMode || 'false';
       this.lineWidth = json.lineWidth || 1;
@@ -94,7 +95,7 @@
         },
         yaxis: {
           font: this.font,
-          min: 0,
+          min: this.min,
           max: this.max
         }, 
         xaxis: {
@@ -241,6 +242,7 @@
         type: 'Flot',
         title: this.title,
         query: this.query,
+        min: this.min,
         max: this.max,
         timeRange: this.timeRange / 1000,
         graphType: this.graphType,
@@ -266,6 +268,10 @@
       '<textarea type="text" class="query" name="query">{{ query }}</textarea><br />' +
       '<label for="timeRange">Time range (s)</label>' +
       '<input type="text" name="timeRange" value="{{timeRange / 1000}}" />' +
+      '<br />' +
+      '<label for="min">Min</label>' +
+      '<input type="text" name="min" value="{{min}}" />' +
+      '<br />' +
       '<label for="max">Max</label>' +
       '<input type="text" name="max" value="{{max}}" />'
     );