add sourceMap both option - closes #966

src/babel/api/register/node.js

@@ -57,7 +57,7 @@ var compile = function (filename) {
 
   if (!result) {
     result = babel.transformFileSync(filename, extend(opts, {
-      sourceMap: true,
+      sourceMap: "both",
       ast:       false
     }));
   }

src/babel/transformation/file.js

@@ -527,8 +527,11 @@ export default class File {
 
     result.map = this.mergeSourceMap(result.map);
 
-    if (opts.sourceMap === "inline") {
+    if (opts.sourceMap === "inline" || opts.sourceMap === "both") {
       result.code += "\n" + convertSourceMap.fromObject(result.map).toComment();
+    }
+
+    if (opts.sourceMap === "both") {
       result.map = null;
     }