Apply responsive design for labels on graphs

Labels Commits and Continuous Integration graphs now scales if on
mobile.

app/views/projects/graphs/ci/_build_times.haml

@@ -19,4 +19,9 @@
     ]
   }
   var ctx = $("#build_timesChart").get(0).getContext("2d");
-  new Chart(ctx).Bar(data,{"scaleOverlay": true, responsive: true, maintainAspectRatio: false});
+  var options = { scaleOverlay: true, responsive: true, maintainAspectRatio: false };
+  if (window.innerWidth < 768) {
+    // Scale fonts if window width lower than 768px (iPad portrait)
+    options.scaleFontSize = 8
+  }
+  new Chart(ctx).Bar(data, options);

app/views/projects/graphs/ci/_builds.haml

@@ -48,4 +48,9 @@
       ]
     }
     var ctx = $("##{scope}Chart").get(0).getContext("2d");
-    new Chart(ctx).Line(data,{"scaleOverlay": true, responsive: true, maintainAspectRatio: false});
+    var options = { scaleOverlay: true, responsive: true, maintainAspectRatio: false };
+    if (window.innerWidth < 768) {
+      // Scale fonts if window width lower than 768px (iPad portrait)
+      options.scaleFontSize = 8
+    }
+    new Chart(ctx).Line(data, options);

app/views/projects/graphs/commits.html.haml

@@ -59,6 +59,10 @@
     var container = $(selector).parent();
     var generateChart = function() {
       selector.attr('width', $(container).width());
+      if (window.innerWidth < 768) {
+        // Scale fonts if window width lower than 768px (iPad portrait)
+        options.scaleFontSize = 8
+      }
       return new Chart(ctx).Bar(data, options);
     };
     // enabling auto-resizing