Fix lint errors

public/js/site.js

@@ -167,12 +167,20 @@ $(document).ready(function(){
 
     $.each(datasets, function(key, val) {
         var lowerCaseValue = (val.label.substring(0, val.label.length - 1)).toLowerCase();
-        choiceContainer.append('<li class="text-center '+
-        lowerCaseValue +'"><div class="series-checkbox-container"><input type="checkbox" name="' + key +
-        '" checked="checked" id="id' + key +
-        '"/><label for="id' + key +
-        '"><span class="stat-type">' + val.label +
-        '</span></label></div></li>');
+        choiceContainer.append(
+            '<li class="text-center ' + lowerCaseValue + '">' +
+                '<div class="series-checkbox-container">' +
+                    '<input type="checkbox"' +
+                        'name="' + key + '" ' +
+                        'checked="checked" ' +
+                        'id="id' + key + '"' +
+                        '/>' +
+                    '<label for="id' + key + '">' +
+                        '<span class="stat-type">' + val.label + '</span>' +
+                    '</label>' +
+                '</div>' +
+            '</li>'
+        );
     });
     
     choiceContainer.find('input').click(plotAccordingToChoices);