Fix activity pane z-index when music is playing.

Some new graph types (WIP)
Update font-awesome to 4.4.0

data/interfaces/default/js/graphs/plays_by_day.js

@@ -29,6 +29,9 @@ var hc_plays_by_day_options = {
             labels: {
                 formatter: function() {
                     return moment(this.value).format("MMM D");
+                },
+                style: {
+                    color: '#aaa'
                 }
             },
             categories: [{}]
@@ -36,6 +39,11 @@ var hc_plays_by_day_options = {
     yAxis: {
             title: {
                 text: null
+            },
+            labels: {
+                style: {
+                    color: '#aaa'
+                }
             }
     },
     tooltip: {