babel input source map support

Author: guybedford

src/transpiler.js

@@ -55,6 +55,7 @@ var transpile = (function() {
     var options = this.babelOptions || {};
     options.modules = 'system';
     options.sourceMap = 'inline';
+    options.inputSourceMap = load.metadata.sourceMap;
     options.filename = load.address;
     options.code = true;
     options.ast = false;