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_month.js

@@ -0,0 +1,80 @@
+var hc_plays_by_month_options = {
+    chart: {
+        type: 'column',
+        backgroundColor: 'rgba(0,0,0,0)',
+        renderTo: 'chart_div_plays_by_month'
+    },
+    title: {
+        text: ''
+    },
+    legend: {
+        enabled: true,
+        itemStyle: {
+            font: '9pt "Open Sans", sans-serif',
+            color: '#A0A0A0'
+        },
+        itemHoverStyle: {
+            color: '#FFF'
+        },
+        itemHiddenStyle: {
+            color: '#444'
+        }
+    },
+    credits: {
+        enabled: false
+    },
+    colors: ['#F9AA03', '#FFFFFF'],
+    xAxis: {
+            type: 'datetime',
+            labels: {
+                formatter: function() {
+                    return moment(this.value).format("MMM YYYY");
+                },
+                style: {
+                    color: '#aaa'
+                }
+            },
+            categories: [{}]
+    },
+    yAxis: {
+            title: {
+                text: null
+            },
+            labels: {
+                style: {
+                    color: '#aaa'
+                }
+            },
+            stackLabels: {
+                enabled: true,
+                style: {
+                    color: '#fff'
+                }
+            }
+    },
+    plotOptions: {
+        column: {
+            stacking: 'normal',
+            borderWidth: '0',
+            dataLabels: {
+                enabled: false,
+                style: {
+                    color: '#000'
+                }
+            }
+        }
+    },
+    tooltip: {
+        formatter: function() {
+            var monthStr = moment(this.x).format("MMM YYYY");
+            var s = '<b>'+ monthStr +'</b>';
+
+            $.each(this.points, function(i, point) {
+                s += '<br/>'+point.series.name+': '+point.y;
+            });
+            return s;
+        },
+        shared: true
+    },
+    series: [{}]
+};