Added note about ulimit

#103

README.md

@@ -43,6 +43,14 @@ grunt.initConfig({
 })
 ```
 
+## Troubleshooting
+
+### OSX ulimit
+
+Darwin (OS X kernel) has a low limit for file descriptors (256 per process) by default, so you might get an `EMFILE` error or an error mentioning "too many open files" if youtry to open more file descriptors than this.
+
+To get around it, run `ulimit -n 1024` (or add it to your `~/.bash_profile`). For more information, see [henvic/osx-ulimit](https://github.com/henvic/osx-ulimit).
+
 
 ## Release History
 - 2014-08-01    `0.2.0` Moved logic into a separate [module](https://github.com/mllrsohn/node-webkit-builder), config options will be backward compatible except `keep_nw` is no longer supported