prepending text correctly

Tools/Gulp/gulpfile.js

@@ -465,7 +465,7 @@ var buildExternalLibrary = function (library, settings, watch) {
                         // prepend the needed reference
                         fs.readFile(settings.build.dtsBundle.out, function (err, data) {
                             if (err) throw err;
-                            data = settings.build.dtsBundle.prependText + data.toString();
+                            data = settings.build.dtsBundle.prependText + '\n' + data.toString();
                             fs.writeFile(settings.build.dtsBundle.out, data);
                         });
                     });

dist/preview release/viewer/babylon.viewer.module.d.ts

@@ -1,4 +1,5 @@
-/// <reference path="./babylon.d.ts"/>// Generated by dts-bundle v0.7.3
+/// <reference path="./babylon.d.ts"/>
+// Generated by dts-bundle v0.7.3
 // Dependencies for this module:
 //   ../../Tools/Gulp/babylonjs