Use readable-stream for consistent stream API.

Author: izaakschroeder

lib/MemoryFileSystem.js

@@ -4,7 +4,7 @@
 */
 
 var normalize = require("./normalize");
-var stream = require("stream");
+var stream = require("readable-stream");
 
 var ReadableStream = stream.Readable;
 var WritableStream = stream.Writable;

package.json

@@ -29,5 +29,8 @@
     "istanbul": "^0.2.13",
     "mocha": "^1.20.1",
     "should": "^4.0.4"
+  },
+  "dependencies": {
+    "readable-stream": "^2.0.1"
   }
 }