Fix error in IE9 when parsing csv files. IE9 doesn't support response param of xhr callback object. Copy responseText param to response param fixed the issue. Charts now render correctly.

c3.js

@@ -2020,6 +2020,9 @@
             if (!data) {
                 throw new Error(error.responseURL + ' ' + error.status + ' (' + error.statusText + ')');
             }
+            if (!data.resonse) {
+              data.response = data.responseText;
+            }
             if (type === 'json') {
                 d = $$.convertJsonToData(JSON.parse(data.response), keys);
             } else if (type === 'tsv') {

src/data.convert.js

@@ -5,6 +5,9 @@ c3_chart_internal_fn.convertUrlToData = function (url, mimeType, keys, done) {
         if (!data) {
             throw new Error(error.responseURL + ' ' + error.status + ' (' + error.statusText + ')');
         }
+        if (!data.resonse) {
+          data.response = data.responseText;
+        }
         if (type === 'json') {
             d = $$.convertJsonToData(JSON.parse(data.response), keys);
         } else if (type === 'tsv') {