Fixing BasicAuth due to missing btoa().

nodejs/node#3462

src/api/Launchpad.js

@@ -1,13 +1,14 @@
 'use strict';
 
-import Auth from '../api/Auth';
+import Auth from './Auth';
 import Embodied from '../api-query/Embodied';
 import Filter from '../api-query/Filter';
 import Query from '../api-query/Query';
 import TransportFactory from './TransportFactory';
 import ClientRequest from './ClientRequest';
 import Util from './Util';
 import MultiMap from './MultiMap';
+import Btoa from '../btoa/Btoa';
 
 var io;
 
@@ -402,7 +403,7 @@ class Launchpad {
 			clientRequest.header('Authorization', 'Bearer ' + this.auth_.token());
 		} else {
 			var credentials = this.auth_.username() + ':' + this.auth_.password();
-			clientRequest.header('Authorization', 'Basic ' + btoa(credentials));
+			clientRequest.header('Authorization', 'Basic ' + Btoa.btoa(credentials));
 		}
 	}
 

src/btoa/Btoa.js

@@ -0,0 +1,13 @@
+'use strict';
+
+class Btoa {
+	btoa(stringToEncode) {
+		if (typeof btoa === 'function') {
+			return btoa(stringToEncode);
+		}
+
+		return new Buffer(stringToEncode.toString(), 'binary');
+	}
+}
+
+export default Btoa;