Concat and minify lib files

c3.js

@@ -77,7 +77,7 @@
         $$.initParams();
 
         if (config.data_url) {
-            $$.convertUrlToData(config.data_url, config.data_mimeType, config.data_keys, $$.initWithData);
+            $$.convertUrlToData(config.data_url, config.data_mimeType, config.data_headers, config.data_keys, $$.initWithData);
         }
         else if (config.data_json) {
             $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
@@ -1109,6 +1109,7 @@
             data_onselected: function () {},
             data_onunselected: function () {},
             data_url: undefined,
+            data_headers: undefined,
             data_json: undefined,
             data_rows: undefined,
             data_columns: undefined,
@@ -2001,9 +2002,15 @@
         return current;
     };
 
-    c3_chart_internal_fn.convertUrlToData = function (url, mimeType, keys, done) {
+    c3_chart_internal_fn.convertUrlToData = function (url, mimeType, headers, keys, done) {
         var $$ = this, type = mimeType ? mimeType : 'csv';
-        $$.d3.xhr(url, function (error, data) {
+        var req = $$.d3.xhr(url);
+        if (headers) {
+            Object.keys(headers).forEach(function (header) {
+                req.header(header, headers[header]);
+            });
+        }
+        req.get(function (error, data) {
             var d;
             if (!data) {
                 throw new Error(error.responseURL + ' ' + error.status + ' (' + error.statusText + ')');
@@ -2239,7 +2246,7 @@
             $$.load($$.convertDataToTargets(args.data), args);
         }
         else if (args.url) {
-            $$.convertUrlToData(args.url, args.mimeType, args.keys, function (data) {
+            $$.convertUrlToData(args.url, args.mimeType, args.headers, args.keys, function (data) {
                 $$.load($$.convertDataToTargets(data), args);
             });
         }