truffle exec doesn't let me use core modules

[tomconte]

My script contains:

var fs = require('fs');
var crypto = require('crypto');

When I try to run it, I get an error for module 'fs':

C:\Development\BlockChain\ethereum-fossilizer>truffle.cmd exec watcher.js
C:\Users\tconte\AppData\Roaming\npm\node_modules\truffle\lib\require.js:60
              throw e;
              ^

Error: Cannot find module 'C:\Development\BlockChain\ethereum-fossilizer\node_modules\fs'
    at Function.Module._resolveFilename (module.js:440:15)
    at Function.Module._load (module.js:388:25)
    at Module.require (module.js:468:17)
    at require (internal/module.js:20:19)
    at context.require (C:\Users\tconte\AppData\Roaming\npm\node_modules\truffle\lib\require.js:55:22)
    at C:\Development\BlockChain\ethereum-fossilizer\watcher.js:1:10
    at ContextifyScript.Script.runInContext (vm.js:35:29)
    at ContextifyScript.Script.runInNewContext (vm.js:41:15)
    at C:\Users\tconte\AppData\Roaming\npm\node_modules\truffle\lib\require.js:80:14
    at tryToString (fs.js:455:3)
    at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:442:12)

[tcoulter]

This is a good bug, thanks for reporting. Similar to #255, will be fixed at the same time.

[tcoulter]

This is fixed by Truffle 3.1.10 (beta). Will go out as an official release within the next day or so: https://github.com/trufflesuite/truffle/releases/tag/3.1.10

Thanks for the report!